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7623567 Method for transmitting data for controlling railway signal installations of a railway system  
A method for controlling railway signal installations of a railway system by exchanging data between directly adjacent transceivers over electrically conducting rails of a track is disclosed. More...
7357359 Electronic code follower relay  
An electronic code following relay for use in a railroad signaling system includes a timing circuit for receiving an input square wave signal coded at a pre-determined code rate, and regenerating...
7198235 Method and apparatus for the transmission of information between track and vehicle of a model railroad  
A method and apparatus for the transmission of information between a track ( 11, 12 ) and a vehicle ( 13, 14 ) located on the track in a model railroad system, whereby when electrical contact...
6592081 Electronic code generating circuit for use in railroad signaling systems  
An electronic code transmitter is disclosed for driving a number of code following relays of a railroad signaling system. The electronic code transmitter comprises a timing circuit and a driving...
5459663 Cab signal apparatus and method  
An apparatus and method for supplying cab signal to a rail vehicle on a section of track composed of sequentially adjacent railway track circuit blocks. Respective receivers of each track circuit...
4878638 Combination frequency loop coupling for railway track signalling  
An audio frequency (AF) track circuit whereby a railway track tuned loop transmitter operating in a dual resonant mode, for handling, two signal frequencies, can be coupled to the rails. Each...
4766817 Electric power supply system for railway train  
A railway system including a track and a train adapted to run on the track. A power feed line comprising a series of feed sections is provided to extend along the track. A plurality of stations are...
4728063 Railway signalling system especially for broken rail detection  
Broken rail detection in a block of track without the need or expense of conventional signalling uses a chain of transmitters and receivers connected to the rails and defining sections of the block...
4723739 Synchronous rectification track circuit  
An improved audio frequency track circuit system utilizes a synchronous train detection arrangement and reduces the number of fixed code rate modulated carrier signals. As few as two carrier...
4641803 Track circuit  
A railway track circuit arrangement particularly suitable for the short track circuit, down to approximately 40 metres, required in metro transit systems. Based on conventional A.C. track...
4636933 Power control circuit with digital pulse width control  
A bridge network 1 of current switching devices 2, 3, 4, 5 is operated in full wave manner by controlling signals A, B, C, D respectively produced by two similar, parallel and pulse width modulated...
4469298 Axle sensor  
A sensor arrangement is disclosed for detecting the presence of an axle of a rail vehicle in a short length of a track. The arrangement includes a bridge coupled to and including resistances of the...
4442988 Information transmission device through the rails between a railway track and a vehicle assembly circulating on this track  
An improvement in apparatus for the secure transmission of information through rails in zones of propagation independent from the sections of the track block-section system embodying the use of...
4420133 Device for the transmission of information through the rails between a railway track and a group of vehicles running along this track  
A system for transmitting data long rails of a railway track for reception by a receiver mounted on a vehicle of the train. The system includes resonance circuits defining contiguous zones which...
4415134 Hall effect track circuit receiving element  
A railroad signal circuit includes a transmitter and a receiver which have a common connection to the track rails at one end of a signal block. There will be a similar transmitter and receiver at...
4392626 Vital protection arrangement for railroad track circuits  
A tuned transformer element has its primary winding coupled, in series with a fuse of preselected rating, to the rails of the track circuit. A secondary winding supplies input energy to the track...
4392625 Circuit arrangement for a track circuit with multiple signal sources  
A track circuit is disclosed and includes rails which are fed from a main signal transmitter and which rails, at an information point a required distance from the transmitter, are shunted by a...
4373691 Decoupling arrangement for non-insulated AC track circuits in railway systems  
A decoupling arrangement for non-insulated track circuits is disclosed wherein the receiving circuit of the evaluating unit for the AC track currents is electrically separated from the...
4369942 Signal control system  
A railroad signal system includes an A type transmitter and receiver for sending and receiving signal messages in one direction and a B type transmitter and receiver for sending and receiving...
4365777 Train approach detector  
A train approach detector uses frequencies in the audio spectrum to activate grade crossing protection devices in advance of and during the presence of railroad trains at grade crossings. The...
4354649 Arrangement for continuously controlling track-bound vehicles  
An arrangement enabling continuous control of vehicles on a track divided into individual areas comprises at least one track-conductor loop associated with the track in each of the areas having N...
4352475 Audio frequency track circuit for rapid transit applications with signal modulation security  
An audio frequency track circuit with improved security in the train detection function for rapid transit applications for use with uninsulated rails includes an improved transmitter and receiver....
4324376 Railroad highway crossing warning system  
A railroad highway crossing warning system including pickup coils for sensing current flowing in the track rails of an approach zone, a circuit for sensing the voltage across the track rails,...
4320880 Electronic track current switching relay system  
An electronic system which emulates the operation of a polar relay for applying coded pulses to railway tracks has separate signaling circuits having signaling devices responsive to a separate...
4314306 Signal-powered receiver  
A self-powered receiver including a series resonant circuit tuned to the carrier frequency of a modulated carrier signal. A demodulator for detecting the envelope which switches a switching...
4306694 Dual signal frequency motion monitor and broken rail detector  
A highway crossing warning system for monitoring the motion and predicting the time of arrival of an approaching train at the highway crossing and for detecting the presence of a broken rail in the...
4304377 Electrical block separating joints for railway signaling systems  
An electrical joint for separating adjacent block circuits of a railway signaling system in which the rails of the railway track serve as conductors. The upstream circuit block carries first...
4187504 Fault monitoring and indicator system  
A continuity monitor and indicator circuit for monitoring the continuity of a segment of a pair of control conductors along which a control current flows includes capacitors at each end of the...
4149690 Positive-response transit detector for a given transit zone  
An electronic track zone detecting device for providing a signal representing location and direction of travel of a railway apparatus within the zone. The detecting device comprises two frames, of...
4118750 Vital relay operating circuit  
There is disclosed a circuit for energizing a vital relay in response to an input signal that is modulated between two frequencies. A discriminator circuit responds to the modulated frequencies and...
4108404 Arrangement for protecting data communication in a continuous automatic train control system  
A system for protecting data communication against disturbances caused by unsymmetrical standing waves along track conductors wherein automatically controlled terminating resistors are utilized to...
4099692 Transfer apparatus for energy sources  
First and second monitoring channel apparatus detect the level of the normal output and load current, respectively, supplied by a principal energy source to a variable load network. Source output...
4074879 Track signalling system  
A track circuit signalling system for an electrified rapid transit system using significantly fewer components is provided. Instead of a transmitter and receiver at each track circuit boundary,...
4066229 Device for preventing traction power harmonic interference on high frequency track circuits  
An overlay selective harmonic transducer device is installed on affected track circuits, that is, track circuits on which interference with normal functioning has occurred due to traction power...
3974991 Railroad motion detecting and signalling system with repeater receiver  
A first transmitter-receiver movement detector system operable at a first frequency detects a train approaching a first grade crossing or other track location in response to train approach speed...
3955785 Electrical protective circuits  
A detective circuit for railway points composed of three track sections connected together at a junction or for a railway crossing composed of four track sections connected together at a junction....
3951364 Track circuit  
There is described a track circuit for use with a track section which may or may not include a switch. The system detects the presence of a railroad vehicle within the track section as it...
3949959 Antenna apparatus for vehicle track rail signals  
An antenna apparatus is disclosed for coupling audio frequency signals in relation to one or more vehicle track rails of a transit system for the purpose of determining vehicle occupancy of a given...
3946972 Simplified cab signal receiver circuit  
This invention covers train cab signal equipment for receiving frequency modulated rail code signals which, when decoded, provide a zone speed control signal which the railway train traversing the...
3944173 Railroad crossing motion sensing system  
An apparatus for detecting an approaching train within a track section utilizes a transmitter coupled to the rails at a feed point for applying a current to the track section. There is a receiver...
3937427 Cab signal control circuits for railroad interlockings  
In a railroad interlocking, a cab signal transmitter is coupled to the rails at each exit location and at such other locations as are necessary to supply continuous cab signal energy to trains...
3929307 Railway signal system with speed determined movement detector  
A railway signal system for detecting a train approaching a railroad grade crossing, track section or the like transmits in the track a periodically interrupted carrier wave signal the amplitude of...
3907237 Check-in, check-out track circuit arrangement  
A train approach registry relay at the exit end of the approach track section at a signal location is held normally energized over its own stick contact and releases to register the track circuit...
3897921 Interlocking track circuits  
An interlocking track circuit and cab signaling arrangement with particular utility for rapid transit applications. The interlocking has five separate track circuits, one for the two crossover...
3868075 Jointless coded track circuits for railroad signal systems  
Track currents are supplied to the rails of adjoining sections at each location through a track transformer whose secondary serves as a low impedance cross bond to divide the track into sections...
3794833 TRAIN SPEED CONTROL SYSTEM  
High frequency detector track circuits are coupled to the rails at crossbonds which divide the track stretch into sections without insulated joints. The HF transmitters supply track energy both...
3781540 JOINTLESS CODED ALTERNATING CURRENT TRACK CIRCUITS  
Coded alternating current at the same low frequency is supplied at each location to the rails through a track transformer and transmitted in each direction into the adjoining track sections. The...
3715669 RECEIVER FOR A FREQUENCY MODULATED OVERLAY TRACK CIRCUIT  
A receiver is provided for a frequency modulated overlay track circuit in which a frequency modulated signal having alternately occurring extreme side-band components is communicated along a...
3683176 PRESENCE DETECTOR  
Herein is described an apparatus for detecting the presence of a car within a section of railway track. The track section is defined by low impedance electrical connections between rails at...
3666217 TRACK COMMUNICATION SYSTEM FOR CONTINUOUS RAIL  
A communication system for continuous rail track layouts has been provided including a plurality of center fed track circuits. The improvement comprises train occupancy communication means...
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