US1789465A - Train-control system and apparatus - Google Patents

Description

Jan. 20, 1931. J. 5. HOLLQIDAY 1,789,465

TRAIN CONTROL SYSTEM AND APPARATUS Filed Sept. 30, 1921 2 Sheets-Sheet l Z maaaaaaaa-uaag 3a fly/m @Z/ ,1 A 2&2

Jan. 20, 1931. J. 5. HOLLIDAY 1,789,455

TRAIN CONTROL SYSTEM AND APPARATUS Filed p 30. 1921 2 Sheets-sheaf 2 Patented Jan. 20,. 1931 UNITED STATES PATENT OFFICE-- JOHN S. HOLLIDAY, OF NEW YORK, N Y. J MARGARET HOLLIDAY, ADMINISTRATRIX n 013 SAID JOHN SALISBURY HOLLIDAY, DECEASED, ASSIGNOR TO MATTHEW LOUGHRIDGE, TRUSTEE, OFQBOGOTA, NEW JERSEY I TRAIN-CONTROL SYSTEM AND APPARATUS Application filed September 30, 1921. Serial No. 504,436.

This invention relates to train control systems and the apparatus used in connection therewith and has for an object to provide a system of train control which is operated by electromagnetic induction from devices located on the track coacting with devices located on the looomotive anda further object of this invention is the use of a device known as the magnetron used as a medium for receiving an electrical effect from the track device, thereby securing a system which is highly sensitive, operative through a wide margin of safety and operating with a high degree of efliciency and reliability, which are essentials for apparatus of this kind. These and other objects of this invention will be understood from the following specification and the accompanying drawings in which Fig. 1, is an outline drawing showing the working principles of the magnetron as applied in the present invention to produce a retarding effect on the locomotive, Fig. 1a, is a sectional detail with referenceto Fig. 1, Fig. 2 is a side elevation of the track device, Fig. 3 is a plan view of the apparatus shown in Fig. 1, complete with the magnetizing coil in place, Fig. 4 is another form of magnetron and applied to give a proceed signal to the locomotive, F'g. 5 is an elevation of the track device as shown in Fig. 2, F ig'. 6 is a diagrammatic "iew showing the principles of the operation of the apparatus in Fig. 4, Figs. 7 and 8'are details indicating the principle-s of operation of the apparatus with reference to'Fig. 6, Fig.

9 is a wiring diagram of one method of ap-- plying the apparatus on the locomotive, and Fig. 10 is a wiring diagram of the apparatus as it may be installedin the track.

' The system its-disclosed in this invention includes means for communicating proceed,

caution and stop signals to the ;-.locomotive,

also in combination with-'the stop signal a means is provided for operating the brake apparatus. The present invention does not disclose a system of speed control, although the apparatus itself can be readily adapted for this purpose to any of the well-known speed control systems heretofore proposed either using a centrifuge device or a de ice operating on a time. interval basis from'track devices of varying lengths.

The effects which operate the signal apparatus on the locomotive are communicated from the track according to track conditions by electromagnetic induction and the apparatus may be described under two headings, i'. e., that which produces a retarding or stop effect on the locomotive, known as the stop apparatus and that which produces a proceed efiect on the locomotive known as the proceed apparatus. The stop and proceed apparatus make use of a device known as a magnetron which is a vacuum tube device, responsive to the principles of electromagnetic induction and the track device is provided with a suitable apparatus to influence both the stop and in which'll and 12 are two parallel bars of magnetic iron placed on the track, parallel with the running rails and having at intervals a'core 13 connecting the poles 11 and 12, apd provided With a coil 14. Any number 0 these coils may be provided and may be connected in series or in series multiple.

-' For the purpose of the present invention the coils are so'connec'ted that one of the mag; netic bars becomesa north pole and theother becomes a south pole whenthe coils are en-. .ergized and when these coils are deenergized, there is no ma etism in these bars; The track device is s oped or ramped at each end and is sometimes'ji'eferred to as a track ramp, although no physical contact is made hetween it and the locomotive apparatus, for

the purpose of the present invention.

The stop apparatus will be understood by v a study of Figs. 1, 1a and 3. This consists of a glass tube 21 which has been vacuumed and placed between the poles 16 and. 18. Pole 16 has an extended pole piece 15', arranged to intercept the vertical plane of the magnetic bars 11 and 12, as indicated in Fig. 3 and the ole 18 has a corresponding pole piece 17 hese pole pieces are heldin position with respect to each other by the nonmagnetic bars 19 and 20. The glass tube 21 is provided with a metallic cylindrical anode 24 and a filament 23, passing through the centre; also with a magnetizing coil 22 on the outside. The operation of the apparatus requires that the filament or cathode be heated and for this purpose as well as for energizing coil 22, the battery 26 is provided having one pole connected to the cathode wire 23 and the other pole connected to coil 22.'- The opposite end of 'coil 22 connects to the opposite end of the cathode wire. This arrangement, therefore, connects battery 26 in series with the cathode wire and the magnetizing coil 22, thus maintaining the temperature of the cathode and creating a magnetic flux in the tu e.

Relay 30 connects by wire 29 to the cathode 23 and by wire 28 connects to battery 27 and to the anode-24. If, therefore, a circuit is established" between the anode and the cathode inside the vacuum tube, relay 30 will be energized from battery 27 and if thiscircuit is interrupted, -relay 30 will' be deenergized. I

A well-known principle of vacuum tubes is that when the cathode is heated and a; voltage is impressed between the anode and cathode, a circuit is established between them as occurs in the present case, between 23 and 24. This circuit, however, is influenced b an exterior magnetic field in the following manner: p

When the magnetic flux generated by the coil 22 is below a certain critical value, the electrons discharged from the cathodeatraverse a path as indicated by the dotted lines in the lower illustration in Fig. 1a. When, however, the flux generated in coil 22 exceeds this critical value, the electrons" traverse paths similar to the upper illustration in Fig. 1a. In the former case it'will be noted that the electrons pass from the" cathtyde to the anode and therefore establish a cireui but in the latter case, they turn back; upon themselves and do not reach the fiIlOde and theres fore fail to establish a circuit. Thelch a'ngefrom one of these conditions to the other in practice occurs abruptly so that the operation of the apparatus is reliable and efficient at the critical value the paths of the electrons becoming tangent'togthe anode.

The illustrationainFi'g. 3 showsthe vacuum tube inserted in jaws formed in the poles 16 and 18. This is for convenience in inspecting and replacing tubes. The coil 22 generates a flux which energizes the poles 16 and 18 and also'the space between these poles. This flux, however, is below the pre- I determined value which will open the cir cuit between the anode and the cathode. As soon, however, as the pole pieces 15 and'l'l' pass through the vertical planes of the magnetic plates 11 and 12, the flux from the magnetizing coil 22 is thereby greatly strengthened, due to the reduction in the air gap between these pole ieces. This in turn increases correspondmgl. the flux throughthe vacuum tube 21, there y setting up the conditions which cause the circuit to open between the anode and the cathode and thus deenergizes the block relay 30, during the time that this device is passing over the track ramp. The track-ramps are usually placed on a higher plane than the top .of the running rails so that when this device passes over the rails themselves at across-over or switch, the air gap is so much greater that the device is not, falsely operated thereby.

The? magnetron illustrated iii Fig. 4 is appole 38 having the pole piece 37, aligning with the magnetic plate 12. These poles are held in alignment by the non-magnetic bar 39. Between these pole pieces the vacuum tube 31 is placed, having a hot wire cathode 42 and two'separate sets of anode plates 44 and 45 which are insulated from each other by the 'insulation 43. These are spaced around t e'tube as indicated in Fig. 6. Thecathode connects to wire 52, battery 55 and by wire 56 to the other end of the cathode, thus permanently heating the cathode wire from ttery 55 as indicated in Fig. 4. Relay 53 it will be noted, has a differential winding, the central point connecting by wire.50 to battery 51 and the other side of this battery connects by wire 52 to the cathode 42. One end ofthe differential winding connects by wire 48 to the anode 44 and the other end of the differential winding connects by wire v49 to the anode 45. If a circuit is established from the anode to each of the cathodes then each coil of the differential winding will be ,equally energized thereby neutralizing each other and the armatures of'this relay will not be moved. On the other hand, if a circuit is established from the cathode to the anode" 44, then relay 53 will be energized with a certain polarity, attracting the neutral armagture 61 and moving the polarized armature 62 in accordance with the. polarity of the magnetizing coil. Also, if a circuitisestab' lished from the cathode 42 to the anode '45, relay 53 will be energized with opposite polarity by the other coil, attracting armature 61 and moving the polarized armature into the opposite position. The-first condition is established as indicated in Fig. 6, when the electrons pass from the cathode 42 in equal numbers to each set of anode plates 44 and 45, as shown by the dotted lines.

From Fig.6, it will be hoted that all the anode plates 44 on one side of the insulation 43 are connected in multiple to the wire 46 and all the anode plates 45 -on the opposite side of this insulation are connected in multiple to the wire 47, connecting respectively to the wires 48 and 49 which are the leads of the differential relay 53.

The path of' the electrons is influenced by the magnetic-lines of force in a manner similar to the conductors in a motor armature, generally known as Flemings rule. A magnetic field inone direction causes the electrons to traverse curved paths so that when they pass from the'cathode 42' to the anode 45, for instance, as illustrated in 7, they are moved away from the anode 44,

and when the magnetic field is in the reverse direction, they traverse paths as illustrated in Fig. 8, from the cathode 42 to the anode 44 and move away from the anode 45.

The application of this principle will be understood by considering the track magnet in Fig. 5, in combination with the arrangea ment shown in Fig. 4. When the coil 14 is energized, for instance, a magnetic flux is impressed upon the pole-pieces and 37 by electromagnetic induction, thereby setting up a field between the poles 36 and 38. When the pole 36 is energized with north polarity then the electrons may set up the condition corresponding to Fig. 7, establishing acircuit between the cathode 42 and the ,anode and when pole 38 is energized with north,

polarity,-this'may set up the conditions corv responding to Fig.- 8, establishing a circuit between the cathode 42 and the anode 44. It will thus be noted that under normal conditions, when the magnetron 41 is not over a ramp or is passing over a deenergized ramp, the electrons pass equally between the cathode and the two sets of anode plates,thus setting up a circuit in the difi'erentiahrelaiy which neutralizes itself.

. As soon as this magnetron passes over a ramp energizing the pole 38 with north polarity,

then the circuit between the cathode and the anode 4 5, is interrupted and aicircuit isestablished between the cathode and the anode 44, thus energizing the other coil of the differential relay and thereby reversing its polarity. The arrangement is thus equivalent to a polarized system, operating the relay, however, without contacts and with a high degree of reliability, notwithstanding the large air gaps in the magnetic circuit of the poles 36 and 38. Should the magnetism of the track magnet 14 become excessive, the electrons might establish a condition similar to Fig. 1a,, (top view) this however, is very unlikely to occur due to the air gap in the circuit of=the track magnet. If it did occur it would merely deenergizerelay 53 and pre vent a clear signal. being received."

It will be noted in connection with the stop" device shown in Figs. 1 and 1a that the cylindrical anode 24 has a gap on the lower side 25, beneath the cathode wire 23: An objectof this gap is to guard again's't'the' wire 23, making a short circuit with the" anode 24 in case the wire should become broken.

is connected in series with the cathode wire 23 so that in case'the magnetizing coil is disconnected, the cathode is deenergized and cools ofi' and thus becomes inoperative to establish a circuit.

The application of these devices on a locomotive will be understood by a study of the circuit arrangement shown in Fig. 9. In this 'case a proceed device is placed on each side tiple arrangement also insures less resistance in the'o erationiof the circuits. The central point 0 differential relay 53 connects to hate tery 51- and by wire 52 connectsto the'cathodeof each of the proceed devices. Wires 48 and 49 connect each of the outer ends of the coil windings of relay 53 to the two sets of anodes The broken ends in this case, will fall through the gap to the glass walls of the tube. Also, it will be noted that the magnetizing coil 22 ion of the proceed devices as shown in Fig. 4.

This causes relay 53 to be energized when proceed'devices' pass over an energized ramp and also causes the ,polarized armature 62 to respond to the direction of polarity in the track device. Itshould be noted that relay 53 is herein regarded as deenergized when the neutral contacts 6161a are inthe lowered position. e

Relay30 as shown in Fig. 9 has a stick circuit and a pick-u circuit. The pickup circuit can be traced rom wire 72, battery 27, wire 71, contact ,61 of relay 53 and wire 73.

' This picks up relay 30 each time that relay 53 closes contact'61: The stick circuit for this relay canbe traced from wire 74, contact 75 ,wire 76,'stop'device 21and wire 77 to wire 71. As long as a circuit is established between wires 76 and 77, through the stop device 21, relay 30 remains energized. It has been shown, however, that this circuit is. interrupted'each time the stop device passes over the magnetic plates of a track ramp. Thus, the stick circuit for relay 30 is inter rupted on each' track ramp encountered and the pick-up circuit must be established at each ramp in order tomaintain the proceed effect. This is a circuit arrangement commonly used in systems of this kind. 89 is a cab signal device energized by wire 80, battery 81, wire 82, contact 83 of relay 30 when said relay is energized, wire 84, contact 61a of relay 53 deenergized, polarized contact 62 in the right hand position, wire 85 to the green light G, thus giving a proceed signal. Another circuit is established when the polarized armature 62changes to the opposite position through wire 86 to the yellow light Y and a third circuit is established when relay 30 is deenergized through wire 87, to the red light R. This gives a green or proceed signal when relay 30 is energized and the armature 62 has been moved to a predetermined position, a yellow or caution signal, when relay 30 is energized and the armature 62 has been moved to another predetermined position, and a red or stop signal when relay 30 is deenergized. Thus, the signal device 89 is operated in response to the characteristics of the current energizing the trackway device 14.

-An arrangement may be provided in combination with this system for operating the train brakes. including the brake valve 88 operated by magnet yoke 120 energized over a circuit including wire 80, battery 81, wire 82, contact 83 and Wire 84. This magnet re mains energized and holds the valve 88 closed" while a proceed orcauti-on signal is established but is deenergized and opens the valve when a red or stop signal has been retceived. Various combinations in the applica ion of the brake valve are usually'adopted to meet the operating condition of a railroad and are sufliciently well-known without being illustrated in detail in connection with the present invention. Armature 121 rotates between the poles of the yoke 120 and carries a crank which raises arm 123 to close the valve when in the position shown in full lines but when in the position shown by the dotted lines,

this valve is opened. A-counterweight 124 is provided on the crank arm giving it a bias to the dotted position. It will be noted that this armature will take up a position on either side of the vertical centre when the yoke is? energized and in normal operation when deenergized takes up the dotted position to be held in this position after the yoke is energized. For the purpose of closing the valve therefore, a manually operated resetting plunger 122 is provided which engages the crank arm and swings the armature into the position shown by the full lines where it is held as long as the yoke is'energized. A quick stroke of plunger 122 gives the aims,- lure its initial start but the inertia of the armature carries it over the vertical centre to the position shown, which closes the valve.

By this arrangement it will be noted that each time the yoke 120 is deenergized the valve is opened and remains open after this yoke is energized again until it is manually reset: also that if the resetting plunger were held in the released position it would not prevent the valve from opening. It should be noted that by controlling the proceed and caution signals through a back contact of relay 53, that in case this relay should become energized improperly, this will immediately extinguish the proceed or caution signal.

The track arrangement is illustrated in relay 97. WVhen this contact is in one posi-.

tion, the coil 14 is energized through wire I 112 from battery 107 and when contact 106 is in the opposite position, coil 14 is energized from battery 108. Opposite poles of batteries 107 and 108 are connected to wire 112,

thereby changing the direction of current to coil 14 in accordance with the position of contact 106. Line relay 97 connects to the cominon wire 98 and is controlled by wire 99,

contact 100 of track relay 94, wire 101 and contact 102 of the track relay for the next succeeding block, wire 103 and battery 104.

This causes contact 106 to move to one position and when the track relay 94 for the next succeeding block is deenergized, contact 102 connects to battery 105, having. opposite polarity to battery 104, thereby changing the position of contact 106 and thus changing the polarity of the current energizing coil 14. When the track relay for the block'immediately in advance of the ramp is deenergized, the circuit of coil 14 isinterrupted at contact 110, and consequently the ramp is deenergized so as to cause a stop signal; when this block is clear and the next succeeding block is occupied the polarity of the current in the line relay 97 is in a direction to energize coil 14 with a polarity which will'give a caution signal. When the two blocks immediately ahead of the ramp are clear, the polarity to the coil 14 is in the proper direction, I

to 'give a proceed signal to the locomotive apparatus. A

The device on the vehicle responsive to the track devices has been designated the magnetron as its operation is associated with magnetism. This magnetism is obtained from the track by induction and in the drawing's a magnetic ramp 11 is shown by means of which the ma netic field on the track is translated to in uence the vehicle devices.

It is. apparent that the magnetron will re--- spond to a magnetic field from any source and 'is'not limited to the particular fype of magnet shown. A magnetic field therefore that is controlled corresponding to magnet 11 is the equivalent of this device and should be so understood in the specification and claims.

This invention shows certain novel appli- The form of my invention described includes certain novel arrangements of apparatus on the train and certain novel con-' structions on the trackway. To someextent' the trackway apparatus co-operates with the specific locomotive apparatus shown, but in general, the locomotive apparatus can be applied with a variety of types of trackway apparatus such as will produce the controlling effects on the locomotive .apparatus described; also, the trackway apparatus may be used to operate other arrangements of locomotive apparatus from that shown, it is to be understood, therefore, that this invention covers a full range of equivalents for the apparatus and arrangements shown, both on the t'rackway and on the train, and is not to be limited except as defined in the claims.

Having thus described my invention, I claim:

1. In combination, a railway track, a vehicle thereon, a magnetic device on said track, a vacuum tube device on said vehicle coacting with said track device and a circuit on said vehicle associated with said vacuum tube.

a 2. In combination, a railway track, a vehicle thereon, a magnetic device on said track, a vacuum tube device on said vehicle responsive to the magnetism of said track device and a circuit on said vehicle associated with said vacuum tube device.

3. In combinatlon, a railway track, a vehicle thereon, a magnetic device on said track,

a vacuum tube device on said vehicle responsive to the magnetism of said track device, an inactive translating device associated with the circuit of said vacuum tube device and means for rendering said translating device active by the magnetism from said track device.

hicle thereon, a magnetic field on said track, a'vacuuin tube device on said vehicle, a circuit on said vehicle associated with said vacuum tube device, a translating device energized 4. In combination, a railway track, a ve-' only by said circuit and means for operating said translating device in response to the polari'ty of the current energizing said field.

5. In combination, a' railway track, a vehicle thereon, a magnetic device on said track, a vacuum tube device on said vehicle, a circuit on said vehicle associated with said vacuum tube device, a polarized relay operatively connected with said circuit, said relay responding to the polarity of the current.

6. In combination, a railway track, a vehicle thereon, a magnetic device on said track, a vacuum tube device on said vehicle, a circuit on said vehicle associated with said vacuum tube, a relay operatively connected with said circuit and means for controlling a circuit by said relay when said vacuum tubedevice is ma netized fromsaidt rack device.

7; In com ination, a railway track, a vehicle thereon, a magnetic device on said track, a vacuum tube device on said vehicle coacting with said magnetic device, a circuit associated with said vacuum tube device and means for 'deenergizing said circuit when said! vehicle device passes through the vertical plane of said track. device.

8. In combination, a railway track, a vehicle thereon, a magnetic device on said track, a vacuum tube device on said vehicle, a coil for magnetizing saiddevice, a circuit on sald vehicle associated with said vacuum tube device and means for deenergizing said circuit when said vehicle device comes under the influence of, said track device.

9. In combination, a railway track, a vehicle thereon, a vacuum tube device on said vehicle, means for impressing a magnetic flux on said vacuum tubedevice, a circuit associated with said vacuum tube and means on said track affecting said magnetic flux, whereby said circuit'is deenergized.

10. In combination, a railway track, a vehicle thereon, a vacuum tube device on said vehicle, a circuit associated with said vacuum tube, a'device on said track and means for impressing a magnetic flux from saidtrack device upon said.vacuum tube device, thereby afl'ecting the operation of said cirf cuit.

11. In combination, a railway track, a vehicle thereon, a vacuum tube device on said vehicle having apair of poles, a circuit asso-v ciated with said vacuum tubedevice, a device on said track and means for magnetizing said poles from said track device, thereby affecting the operation of said circuit.

' 12. In combination, a railway track, 9. vehicle thereon, a vacuum tube device on said vehicle having a pair of poles, a circuit asso--, ciated with said vacuum tube device, a device on said track having a pair of poles and means for magnetizing the poles of said vehicle device in res onse to the oles of said track device, there y affecting t e operation of said circuit.

, 13. In combination, a railway track, a vehicle thereon, a vacuum tube device on said vehicle, said device having a separate pair of anodes and a cathode, circuits'with a translating device associated with each of said anodes and said cathode, a magnetic device on said track and means whereby the magnetism .of said track device afiects the operation of said translating device.

14. In combination, a railwa track, a vehicle thereon, a vacuum tube evice on said vehicle, said device having a separate pair of anodes and a cathode, circuits associated with each of said anodes and said cathode, a magnetic device on said track and means whereby -the magnetism from said track device interrupts the circuit'from one of said anodes to said cathode.

15. In combination, a railway track, a vehicle thereon, a vacuum tube device on said vehicle, said device having a separate pair of anodes and a cathode, circuits associated with each of said anodes and said cathode, a magne'tic device on said track and means'whereb magnetism of one polarity from said trac device will interrupt the circuit from one of' said anodes to said cathode and magnetism of the opposite polarity will interrupt the cir- .cuit from the other of said anodes to said hicle thereon, a vacuum tube device on'said vehicle, said device having a pair of longitudinal anodes se 'arated by an insulating plate and a catho e, circuits associated with each of said a'nod'es and said cathode, a device tudinal anodes se arated by an insulating on said track and means for controlling said track device whereby the circuit between said cathode and either of said anodes may be interrupted. I

18. In combination, a railwa track, a vehicle thereon, a vacuum tube evice on said vehicle, said device having a pair of longis plate and a cath e, circuits associated with each of said anodes and'said cathode, a. differential rela device on sai track and means for controlling said track device whereby the current in either side of s'aid'difi'erential relay may be increased over the current in the other side.

' 19. In combination, a railway track, a vehicle thereon, a vacuum tube device on said vehicle, said device having a separate pair of anodes and a cathode, a differential relay, one

included in said circuits, a-

winding of said relay connecting to each of said anodesv and the neutral point of said windingconnecting to said cathode and to 'a battery and means on the track for varying the current to each winding of said relay.

20. In combination, a railway track, a vehicle thereon, a vacuum tube device on said vehicle, said device having an anode. and a cathode, a coil for supplying a magnetic field for said device, said coil connected in series with said cathode, a circuit associated with said anode and cathode and means on the track for varying said magnetic field.

21. In combination, a railway track, a vehicle thereon, a vacuum tube device on said vehicle, said device having an anode and a cathode, a coil for supplying a magneticfield for said device, means whereby said coil is deenergized when said cathode is disconnected, a circuit associated with said anode and cathode and means on the track for varying said magnetic field.

22. In combination, a railway track, a vehicle thereon, a vacuum tube device on 'said vehicle, said device having an anode and a cathode, a coil for supplying a magnetic field for said device, said device havinga cylindrical anode with a longitudinal gap in its lower side, a cathode in the centre of said anode, a circuit including a translating device associated with said anode and cathode, a magnetic device on the track and means whereby said track device varies the current in said circuit.

23. In a railway traflic controlling system, in combination, a'railway track, a vehicle thereon, amagnetic device on said track controlled by trafiic conditions, a vacuum tube device on said vehicle having a circuit, said vacuum tube device coact-ing'with said magnetic device, a control deviceasso'ciated with said circuit and means for Boperating said control device from said track device.

I 24. In a railway trafiic controlling system in combinatiom a'railway track, a vehicle thereon, a device on said track controlled by ,trafiic conditions, a vacuum tube device on said vehicle having magnetizing means and a circuit, a control device associated with said circuit and means for operating said control device to control said vehicle by said track device. I

' 2'5. In a railway traflic controlling system, in combination, a railway track, a vehicle thereon, a device on said track, a vacuum tube device on said vehicle having magnetizing means and a circuit, a stick relay associated with said circuit 'and means for deenergizing said stick relay by said track device.

26. In a railway'traific controlling system, in combination, a railway track, a vehicle thereon, a magnetic device on said track con trolledby trafiic conditions, a vacuum tube device on said-vehicle coacting with said Cal track device, a circuit including a stick relay associated with said vacuum tube device, and means for energizing said stick relay when said track device is magnetized.

27. In a railway trailic controlling system, in combination, a railway track, a vehicle thereon, a magnetic field on said track, a plurality of vacuum tube devices on said vehicle, a circuit associated with each of said devices, a translating device.controlled by said circuits, said vacuum tube devices responsive to said magnetic field whereby one of said tubes deenergizes said translating device and the. other energizes said translating device. i

i 28. In a railway trafiic controlling system, in combination, a railway track, a vehicle thereon, a device on said track, a plurality of vacuum tube devices on said vehicle, a stick relay onsaid vehicle having a pick-up circuit and a stick-u circuit, the pick-up circuit associated with one of said vacuum tube devicesand the stick-up cirbuit associated with the other vacuum tube device, means whereby the said stick-up circuit is opened and the pick-up circuit is closed when aid tu'be devices pass' over said 'trackdevice;

29. In a railway traflic control-ling system, in combination, a railway track, a vehicle thereon, a device on said track controlled by traffic conditions, a controlling mechanism on said vehicle, a vacuum tube device on said vehicle controlling said mechanism to retard said vehicle and another vacuum tube device.

controlling said mechanism to produce a nonretarding condition on said vehicle, said vacuum tube devices responding to said track device.

' 30. In a railway tralfic controlling system, in combination, a railway track, a vehicle thereon, a magnetic device on said track controlled by traffic conditions, a controlling mechanism on said vehicle, a vacuum tube device onsaid vehicle controlling said mechanism to retard said vehicle and another vacuum tube. de'v,ice controlling said mechanism to produce a non-retarding condition on said vehicle, said first vacuum tube device responding to said track device and said second vacuum tube device responding to the magnetism of said track device.

31. In a railway trafiic controlling j'systeln,

in-combination, a railway track, a vehicle thereon, a magnetlc field on said track controlled by traflicY-conditions,'acab signal on said vehicle, avacuum tube device, a circuit associated-with said vacuum tube device, a

translating device energized solely said circuit controlling said signal and arranged to give a proceed indication when saidtrack field is magnetized with one polarity and to give a caution .signalwhen said track field is magnetized with opposite polarity.

32, In a'railway trafiic controlling system,

iii combination, a railway track, a Vehicle thereon, a magnetic device on said track controlled by traflic conditions, a cab signal on said vehicle, a vacuum tube device on said vehicle responding to said track device, causing said signal to givea stop indication, and another vacuum tube device on said vehicle responding o the magnetism in said track device to give a caution or clear signal.

33. In a railway trafiiccontrolling system, in combination, a railway track, a vehicle thereon, a device on said track controlled by trafiic conditions, a controlling mechanism on said vehicle having a retarding and a nonretarding condition, a vacuum tube device on said vehicle responding to said track device and meanswhereby said Vacuum tube device coacti'ng with said track device establishes the'aretarding condition in said mechanism. v

34. In a railway traflic controlling system, in combination, a railway track, a vehicle thereon, a device on said track controlled by traflic conditions, a controlling mechanism on said vehicle having a proceed circuit and a stop circuit, a vacuum tube deuum tube device, the indication of said signal' being controlled by the contacts of said relay when in its neutral condition.

. 36. In a railway traflic controlling system, in combination, a railway track, a vehicle thereon, a device on said track controlled by traffic conditions, a cab signal on said vehicle, a vacuum tube device on said vehicle responding to said track device, 'a differential relay associated with said vacuum tube device, said differential relay having a neutral armature and means for detecting if the neutral armature of said relay is in the raised position when said vacuum tube device is not under theinfluence of said track device.

37. In a railway traflic controlling system, in combination, a railway track, a vehicle thereon, a magnetic field on saidtrack controlled. by trafiic conditions, a? vacuum tube device on said vehicle, controlling a circuit, said device responsive to said track field and means controlled solely by said'circuit for obtaining one effect on said vehicle when 'said track field is energized by. current of one polarity and for obtaining a different effect when it is energized by current ofopposite polarity.

hicle thereon,-a device on said track controlled by traffic conditions, a device on said vehicle responsive to said track device, a brake valve controlled by said locomotive device, and a manually operated mechanism for partially closing said valve and operat ingin combination with the inertia of said valve for closing the same.

40. In a-railway'traflic controlling system, in combination, a railway track, a vehicle thereon, a device on said track controlled by trafiic conditions, a device on said vehicle responsive to said track device, an electrically operated brake valve consisting of a rotating armature between a pair of poles, said armature having a neutral zone on a line between said poles and when movedbeyond this line in one direction, said valve is opened and when moved in the opposite direction, said valve is closed, said valve being controlled by said vehicle device.

41. In a railway traflic controlling system, in combination, a railway track, a vehicle thereon, a device on said track controlled by traflic conditions, a device on said vehicle responsive to said track device, an electrically operated brake valve consisting of a rotating armature between a pair of poles, said armature having a neutral zone on a line betweensaid poles and biased to move beyond this line to open said valve and means for manually resetting said armature to the opposite. position to close said valve, said valve being controlled by said vehicle device.

42. In combination, a railway track, a vehiele thereon, a vacuum tube device on said vehicle, said device having an anode and a cathode, a coil for ,supplying a magnetic field for said device, means whereby said coil is deenergized when said cathode is broken, and a circuit on said vehicle as sociated with said anode and cathode.

43., In a railway traflic controlling system, in combination, a railway track, a vehicle thereon, a device on said track, a vacuum tube device on said vehicleiresponsive to said track device, a circuit associated with said 'vacilum tube device and adircct current polarized re:

lay operated by said circuit.

44. .In a railway trafic controlling system, in combination, a railway track, a vehicle thereon, a device on said track, a vacuum tube .windings with a device on said vehicle responsive to said track device, a circuit associated with said vacuum tube device and a relay having opposing windings operated by said circuit.

45. In a railway traflic controlling system,

in combination, a railway track, a vehicle thereon, a device on said track, a vacuum tube device on said vehicle responsive to said track device, a circuit associated with said vacuum tube device and a relay having opposing by said circuit. v

46. In combination, a railway track, a vehicle thereon,a magnetic field on said track controlled by traflic conditions, a plurality of vacuum tube devices on said vehicle independently responsive to said track field, a circuit associated with both of said vacuum tube devices and a translating device operated solely by said circuit to the proceed position.

,47. In combination, a railway track, a vehicle thereon, a magnetic field on said track, a plurality of vacuum tube delices on -.said

vehicle responsive to said track field, said tube devices arran ed to control a direct current circuit in mu t1 lo and a translating device operated by sa1 circult.

'48. In a railway traflic controlling system, i

in combination, a railway track, a vehicle thereon, a device on said track controlled by taflic conditions, a vacuum tube device on said vehicle responsive to said track device and controlling a circuit, and a translating device operated by said circuit, said translating device having a polarized element and a neutral element 'and capable of taking up either of two positions when said translating device is energized.

polarized armature operated 49,. In a railway trafiic controlling system,

in combination, a railway track, a vehicle thereon, a device on said track controlled traflic conditions, a vacuum tube device on said vehicle responsiveto said track device and controlling a circuit, a translating device operated by said circuit, said translatingdevice having a polarized element and a neutral element, one of said elements capable oftaking up either of two positions and means for positioning said element.

in combination, a railway track, a vehicle thereon, a device on said track controlled by traflic conditions, a device on said vehicle re sponsive to said track device and controlling a circuit, a translating device operated by said circuit and havin an element capable of taking up either 0 two positions and means in combination with the inertia, ofsaid element for moving it to a predetermined position.

51. In a railway trafiic controlling system,

in combination, a railway track, a vehicle thereon, a device on said track controlled-by trafiic conditions, aidevice on said vehicle responslve to said track dev1ce,..a signaling de- 50. In a railway traflic controlling system,

vice on said vehicle, a differential relay having opposing windings controlled by said vehicle device and controlling a stick relay, said stick relay controlling said signal device.

52. In a railway traflic.controlling system,

in combination, a railway track, a vehicle thereon, means on said track controlled by trafiic conditions, a device on said-vehicle responsive to said .track means operating a translating device, said translating device comprising a pair of poles, an armature pivoted between said poles, said armature having a neutral zone on a line between said poles and capable of being positioned on either side of, said neutral zone when said poles are enere 53. In a railway trafiic controlling system, in combination, a railway track, a vehicle thereon, means on said track controlled by traffic conditions, a device on said vehicle responsive to said track means operating a translating device, said translating device comprising a pair of poles, an armature pivoted between said poles, said armature having a neutral zone on a line between said poles,

means for positioning said armature and meansfor magnetizing said poles to hold said armature in position.

54. In a railway trafiic 'controling system, the combination of a railway track, a vehicle thereon, means on said track controlled by trailic conditions, a device on said ve- "hlcle responsive to said track means, a relay with opposing windings controlled by said device, and means for varying the current in both of said windings by said track means.

55. In a railway trafiic controlling system,

the combination of a railway track, a vehicle thereon, means on said track controlled by trailic conditions, a device on said vehicle responsive to said track means, a relay with opposing windings controlled by said device, said relay having two independent armatures, one .of' said armatures positioned by the difierence of the currents in said windings and the other armature being attracted when said relay is energized.

. 56. Ina railway traflic controlling system, the combination of a railway track, a vehicle thereon, means on said track controlled by traflic conditions, adevice on said vehicle responsive to; said track means, a relay with oppqsin windings controlled. by said device, sai relay controlling a circuit and hav-' ing two independent armatures, one of said armatures positioned b the difference ofv the currents in said win ings, said armatures k controlling said circui in series.

57. In a railway tra c controlling system, the combination of a railway track, a vehicle thereon, .means on said track controlled by trafiic conditions, a device on said vehicle responsive to said track means, a controlling circuit, a relay having'two independent armatures one ofsaid armaturespositioned by the difl'erence of the currents in said windings and controlling saidcircuit and the other armature controlling said circuit in the deenergized position.

58. In a train control system, in combination, a vehicle carried mechanism including an electron discharge device and roadside mechanism for magnetically influencing the electron discharge device for-producing any one of'three difierent indications in the vehicle carried mechanismz 59. In a train control system, in combination, vehicle carried mechanism including a magnetron means and roadside mechanism for magnetically influencing the magnetron means for producing any one of three different indications in the vehicle carried mechanism.

60. In a train control system, in combination, vehicle carried mechamsm. including 61. In a'train control system, in combi-v nation, vehicle carried mechanism including means operable for placing the train under a speed re'striction and an electron dis charge device of which a magnetic field is a controlling component for controlling the operation of said means, and roadside mechanism for influencing the electron discharge device for producing the speed restricting operation thereof.

62. In a train control system, in combination, vehicle carried mechanism comprising means movable into three different positions for producing clear, caution and danger train indications and instrumentalities including a magnetron for controlling the operation of said movable'means, and road;

side mechanism operable in accordance with clear, caution and danger track con-- ditions formagnetically influencing said deproducing anyof said train indications.

a n e e a v vice and for operating said instrumentalities 63. In a train control system, in combination, vehicle carried mechanism including means selectively operable for placing the train-under a speed restriction andfor permitting unlimited speed thereof and a mag-f netron'for controlling the operation of said means, and roadside mechanism for mag-.

netically infiuencin the magnetron for producing the controlling operations thereof.

64. In a train control system, in combination, vehicle-carried mechanism including means operable for placing the train under a speed restriction and an electron discharge device of which a magnetic field is a controlling component operable for controlling the operation of said means.

65. In a train control system, in combination, vehicle carried mechanism including means operable for placing the train under a speed restriction and a magnetron for controlling the operation of said means.

66. In combination, a vehicle circuit including an electron discharge device of which a) magnetic field is a controlling component and roadside mechanism for, influencingthe said device for affecting the circuit.

67. In combination, a vehicle circuit including an electron discharge device of which a magnetic field is a controlling component and roadside magnet mechanism'for magnetically influencing the said device for affecting the circuit.

68. In combination, a vehicle circuit including'a magnetron and roadside mechanism associated therewith for controlling the eluding a normally open thermo-ionic device of which a magnetic field is a controlling component and roadside mechanism operative magnetically thereon for closing the same.

7 2. In combination, a railway track, a vehicle thereon, a vacuum tube device on said vehicle having poles, a circuit conn'ected'gto the electrodes of said tube, said circuitxestablished when said tube is under the influence of a magnetic field, a. circuit for energizing said poles and means on thetr'ack for increasing the magnetic field through said tube.

73. In combination, a railway track, a vehicle thereon, a ma netic rid e on said track, a vacuum tube devlce -on sai vehicle having a pair of poles, acirc-uit connected to theelectrodes of said tube and established when said tube is under the influence of a magnetic field, means for energizing said poles and means on the track for increasing the netic flux through said tube. n

74. A railway traflic controlling system comprising a magnetron, traflic controlled means fdr magnetically afiectingthe electrical conductivity of said magnetron, and traflic governing means controlled by said magnetron.

75.='A railway traflic cont-rolling system comprising a magnetron, means controlled by current in the trackflrail for magnetically.

affecting the electrical conductivity of said magnetron, and traflic governing means con-v trolled by said magnetron.

magi.

76. In combination, railway traflic governing mechanism includin a magnetron, and trafiic controlled means %or magnetically influencing said magnetron.

77. In combination, railway traflic governing mechanism including a magnetron, a track circuit, and means controlled by the our-- rent in said track circuit for magnetically afl'ecting said magnetron.

78. In combination, railway traflic governing mechanism including a. magnetron, and trafic controlled means for impressing a magnetic ux on said magnetron.

79. A ailway traflic controlling system comprisin a ma netron, a traflic controlling circuit inc uding said magnetron, and trafiic controlled means for impressing a magnetic flux on said magnetron to efiect the operation of said circuit. 1

80. In combination, a ra1lway traflic controlled circuit including an electron discharge device of which'a magnetic field is a controlling component, and traffic controlled means for magnetically influencing said device for affecting said circuit.

81. Railway traflic controlling apparatus comprising traflic governing means, and a magnetr on for controlling the operation of said means.

82. In a railway traflic controlling system, in combination, a railway track, a vehicle thereon, trackwa means for producing mag netic' effects, a plurality of vacuum tube devices on saidvehicle responsive to said magnetic'efi'e'cts, a circuit associated with each of said devices, a translating device controlled by said circuits and means whereby onefof said vacuum tube devices operates to deenergize said translating .-device and the other vacuum tube device operates to energize said translating device.

83.- ;In combination, a rail-way track, a vehicle thereon, a magnetic field produced on the trackway by direct current, apole changer. controlling the polarity of said field, a space current device on said vehicle, a circuit on said vehicle associated with said space current device, a translating device operatively connected with said circuit and means in-,

cluding said space current device for operating said translating device in response to the polarity of said field.

' In a railway trafli'c controlling system.

in combination, a railway track, a vehicle thereon, a magnetic field produced on the trackway by direct current and controlled by traflic conditions, a pole changer controlling the polarity otsaid field, a cab signal on said vehicle, a space current device controlling said signal and arranged to, give a proceed indication when said track'j field is magnetized with one olarity and to give a caution signal when said track fieldis magnetized with the polarity in the opposite direction 85. In a railway trafic controlling system, in, combination, a railway track, a vehicle thereon, a magnetic field produced on the trackway by direct current and controlled by tratlic conditions, a pole changer controlling the polarity of said field, a space current device on said vehicle controlling a circuit, said device responsive to said track field and means for obtaining one effect on said vehicle when said track field is energized by 1 current of one polarity and for obtaining a different eifect when said track field is energized by current of opposite polarity.

86. In combination, a railway track, a ve hicle thereon, a ma netic field on the trackway produced by irect current and controlled by traflic conditions, a plurality of sponse to the polarity of the current energizing said field.

88. In combination, a railway track, a vehicle thereon, trackway means producing a magnetic field controlled by trafiic conditions,

' a pluralityof electron tube devices on'said in response to the polarity of the current, energizing said field.

.netic effects, a plurality of'e vehicle independently responsive to said trackway field, a circuit directly associated with both of said electron tube devices and a translating device operated solely by said circuit to the proceed position. 89. In a railway trafiic controlling system,

theco'mbination, a railway track divided into "blocks, a vehicle thereon, trackway means energized by a single circuit producing a' {magnetic field,said single circuit controlled by said blocks,an electron tube device on said vehicle controlled by said single circuit, a circuit associated with said electron tube device, a translating device controlled only by said last named circuit and means associated with said translating device operating 90.v Ina railway traflic controlling system, in combination, a railway track, a vehicle thereon, trackway means for producing magvices on said vehicle responsive to said magnetic eifects,a circuit associated with'each of said devices, a translating device controlled,

by said circuit, said electron tube devices being so connected that one of said devices operates to deenergize said translating device ectron tube dewhile the other device operates simultaneously to energize said translating device.

91. In a railway trafficcontrolling system, in combination, a railway track, a vehicle thereon, a device on the trackway controlled by traific conditions, a device on the vehicle inductively responsive to said trackway device, a normally energized relay on the vehicle controlled by said vehicle device and deenergizedbysaidtrackway device, a translating device on said 'vehicle electrically energized in the proceed position, a second relay on said vehicle operated by said track device and when energized closing a circuit to energize the first mentioned relay, said relays controlling said translating device and means whereby the circuit of said translating device is established by a back contact on said second relay in the deenergized position.

92. In a railway trafiic controlling system,

*in combination, a railway track, a vehicle thereon, a device on the trackway controlled by traffic conditions, a device on the vehicle inductively responsive to said trackway device, a normally energized relay on the vehicle controlled by said vehicle device and deenergized by said trackway device, a translating device on said vehicle electrically energized in the proceed position, a second relay on said vehicle which, when energized, closes a circuit to energize the first named relay and when deenergized operating by a back contact to close a circuit to said;trans- 'lating device.

93. In a railway trafiic controlling system, in combination, a railway track, a vehicle thereon, a device on the trackway controlled by trafiic conditions, a device on the vehicle inductively responsive to said trackway device,a normally energized relay on said vehicle controlling its own circuit and controlled by said vehicle device and deenergized by said trackway device, a translating device on said vehicle electrically energized in the proceed position, a second relay on the vehiclearranged to shunt the control of the normall energized relay where it is controlled y itself and when deenergized, operating to establish the circuit of said translating device.

94. In a railway traflic controlling system,

'in'combination, a railway track, a vehicle thereon, a device on the trackway controlled by trafiic conditions, a device on said vehicle inductively responsive to said trackway device, a normally energized relay on said vehicle controlled by said vehicle device and deenergized by said trackway device, a second relay on said vehicle controlling said normallyenergized relay and a translating device on said vehicle controlled by saidnor mally energized relay in the proceed position and said second relay in the deenergized position to operate said translating deviceto the proceed position.

Ill)

- 95. In a train controlling system, the combination, a vehicle with a controlling mechanism having an operative and an inoperative position, a device for. resetting said mechanism from the operative to the inoperative position and means co-operating with the inertia of said device for operating said mechanism to the inoperative position.

96. In a train controlling system, the combination, a vehicle with a controlling mechanism, a circuit controlling said mechanism, an electron tube controlling said circuit and operating to close said circuit when energized below a critical value. and operating to open said circuit when energized above this value and m'eans on'the trackway for energizing said tube.

97. In combination, a railway trafiic= governing mechanism, a circuit controlling said mechanism, an electron tube controlling said circuit and operating to complete said circuit when energized below a critical value and 'operating to open saidcircuit when energized above this value.

' 98. Railway trafiic controlling apparatus comprising traflic governing means, a circuit controlling said means and a magnetron controllin said circuit and arranged to open said circuit when energized above a critical value.

99. In a train controlling system, the combination, a, track with a vehicle thereon,- a deconditions, ardevice on the vehicle responding' to said trackway device, a controlling mechanism on said vehicle and acircuit comtrolling said mechanism, said vehicle device controlling said circuit and operating tolcom-i plete said circuit when energized be w 'a-crit-v ical value and operatin to open sai circuit when, energized above t e -cr1t1cal value.-

100 In a railway trafiic controllingrsys' tem, the combination, a railway-ftrack vided into blocks, trackway means energized by a single circuit for, producing a magnetic field having different characteristics. controlled by said blocks, an electron tube device on said-vehicle respondin to said magnetic field, a circuit controlle by said elecvice. on the trackway controlled by traffic changing its characteristics in accordance single circuit for producing a magnetic field havi different characteristics controlled by sald blocks, an electron tube device on said vehicle respondin to said magnetic field, a circuit control ed b -said electron tube device in accordance wit the characteristics' of said field and a translating device controlled only by the last named circuit and selectively responsive to said characteristics.

102. In a railway trafiic controlling system, in combination, a railway track divided into blocks, trackway means energized solely by a single circuit for producing a magnetic field having difierent characteristics, said circuit controlled by a plurality of said blocks, an electron tube device on said vehicle responding tosaid magnetic field, a cirteristic of said circuit, an electron tube device on said vehicle responding to said magnetic field, a circuit on said vehicle controlled 7 by said electron tube in accordance with the characteristic of the currentenergizing said trackway means and a translating device controlled by said vehicle circuit in accordance with traflic conditions in said'block.

104. In a railway traflic controlling system, in combination; a-railway track divided into blocks, a track circuit with a track rela'y for each block, arelay controlled by a plurality of said track relays, trackway means energized by an electric circuit for producing a magnetic field, said last named relay controlling said electric circuit and with traffic conditions in said blocks, a single electron tube device on said vehicle inductively responsive to the magnetic field of said trackway means, a-circuifi on said vehicle controlled by said electron tube device in accordance with the characteristic of the circuit energizing said trackway means and a translating device selectively operated b said vehicle circuit in accordance with tra fic conditions in said blocks.

' 105. In a railway traflic controllin .sys-.

tem, in combination, a railway track dlvided into blocks, a track circuit with a track relay for each block, trackway means energized by anelectric circuit for producing a magnetic field, said circuit controlled by a plurality of said track relays, to change its characteristics in accordance with changes in traflic conditions in said blocks, a single electron tube device on said vehicle inductively responsive to the magnetic field of said trackwa means, a circuit on said vehicle contro led by said electron tube device in accordance with the characteristics of the circuit energizing said trackway means and a signal device controlled by said vehicle circuit and arranged to change its indication as the 106. In a railway traflic controlling sys-.

term, in combination, a railway track, trackway means energized solely by a slngle C11- cuit for producing a magnetic field, means on the trackway controlling said circuit to change its characteristics, a vehicle on said track having an electron tube device inductively responsive to the magnetic field. of said trackway in accordance with the characteristics of the circuit energizing said trackway means and a translating device having a plurality of energized conditions selectively controlled by said vehicle circuit. i

107. In a railway traflic controlling system, in combinatiom'a railway track, trackway means energized by a circuit for producing a magnetic field, means on the trackway controlling said circuit to change its characteristics, a vehicle on saidtrack, an

electron tube device on said; vehicle respon sive to the magnetic field of said trackway -means, a circuiton said f vehicle controlled by said electron tube device in accordance with the characteristics of the circuit energizin said trackway means and aItr'anslating evice having a plurality of energized conditions controlled only by said vehicle circuit and selectively responsive to said I hicle thereon, a device the trackway concharacteristics.

108. In a railway traflic controlling system, in combination, a railway track, a vehicle thereon, a device on the trackway controlled by traffic conditions, a device on said vehicle inductively responsive to said trackway device, a normally energized relay on said vehicle controlled b said vehicle device and deenergized, by sai trackway device, a second'relay on 'said vehicle controlling said normally energized relay, a translating device on said vehicle energized the roceed position, a circuit for energizi'j sai translating device and means foresta lishing nditions for closing said circuit by a contact on said normally energized relay in the energized position and'a contact on said second relay in the deenergized position.

4 109. Ina railway. traflic controllingisy's tem, in combinationfarailway track, a vetrolled by trafiic conditions, a device on said vehicle inductively jres onsive tosaid trackwayfidevice a, normaly energized relay on said vehiclecontrolled 1') said" vehicle device and deenergized b ,asai trackway device' a,

second relay on said vehicle controlling sa d normally energized relay and. a translating device on said-vehicle having a pluralit of energized conditions,'. circuits for controlling said translatingdevice and means for estab llshmg'conditions for closing said circuits by said normally-energized lrelay in the enercans, a circuit on the ve'-:

hicle controlled y said electron tube device F gized establishing conditions for a clear sigi nation track divided into blocks, means on the trackway selectively controlled by said blocks in relay in the I said trackway means, a cab signal on said ve hicle giving clear, caution and stop indications, a relay on said vehicle selectively controlled by said trackway means through said inductive responsive means and when enernal and when deenergized establishing conditions for the display of the caution signal.

111. In a train control system, in combination, a track with a vehicle thereon, trackway means selectively controlled by traffic conditions, means on said vehicle including a single electron tube device inductively responsive to said trackway means, a relay on said vehicle selectively controlledby said trackway means through said inductive responsive means, a second relay on sald vehicledeenergized by said trackway means, a translating device on said vehicle having a proceed position established by an energized circuit, and means for establishing the circuit of said translating device by said first named relay deenergized and by said second named relay energized. I

112. In a train control system, in combination, a track with a. vehicle thereon, trackway means selectively controlled by trafiic conditions, means on said vehicle including a single electron tube device inductively responsive to said trackway means, a translating device on said vehicle having a proceed position established by an energized circuit, a pair of relays on said vehicle one of which is selectively confi'olled by said trackway device through said vehicle means and means for establishing the circuit of said translating "device by one of said relays in the energized position and the other in the deenergized imsition.

113. In a train control system, in. combination, a track with a vehicle thereon, trackway means selectively lcontrolled by trafiic conditions, means on said vehicle including an electton tube device inductivelyresponsible to said trackway means, a translating device on said vehicle controlled by anelectric circuit, a pair of relays on said vehicle controlledlby said. trackway means through said vehiclle means and at least oneof said rela s beingselective 1y responsible to said trac way cans and means for establishing the circuit of said translating device when said selectively operated relay is in the deenergized position and theother relay is energized.

114. In a train control system, incombir a track with a vehicle thereon, said accordance with traflic conditions, means on said vehicle including an electron tube device inductively responsive to said trackway means, a signal device on said vehicle giving a caution and a stop indication, electric circuits controlling said signal device, a pair of relays on said vehicle controlled by said trackway means through said vehicle means and at least one of said relays being selectively responsible to said trackway means in accordance with trafiic conditions and means for establishing'the circuit for the caution indication of said signal by a back contact on the selectively responsive relay and by afront contact on the other relay.

115. In a train control system, in combination, a track with a vehicle thereon, said track divided into blocks, means on the trackway selectively controlled by -said blocks in accordance with traffic conditions, means on said vehicle inductively responsive to said trackway means, a signal device on said vehicle giving a caution and a stop indication,

electric circuits controlling'said signal de vice, a pair of relays on said vehicle controlled by said trackway means through said vehicle means and at least one of said relays being selectively responsive to said trackway means in accordance with traflic conditions, the C11- cuit for the caution indicationof said signal device being established by a back contacton the selectively responsive relay and by a front contact on the other relay and the circuit for the stop indication of said signal device being established by a back contact on the said other relay.

Signed at New York city, in the county of New York, and State of New York, this 28th day of September A. D. 1921.

JOHN S. HOLLIDAY.

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