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| Number | Title | Issue Date |
| 7938370 | Method for measuring the speed of a rail vehicle and installation therefor In order to measure a speed of a vehicle having an antenna and travelling on a track formed by two rails, first and second discontinuities are detected. The first discontinuity is detected in a current or voltage of a signal generated by an antenna when the vehicle ... | 05/10/2011 |
| 7296770 | Electronic vital relay A railroad signaling method includes measuring a track current on a first track section, measuring a local voltage on the railroad line wires, determining whether a magnitude of the track current meets or exceeds a threshold value independent of the local voltage, a... | 11/20/2007 |
| 7269487 | Method for train positioning In the state that a train moves from a track circuit 3T toward a track circuit 5T, and a train detection signal TD1 is supplied from the boundary between the track circuits 3T and 5T to the track circuits 3T and 5T, a... | 09/11/2007 |
| 7268565 | System and method for detecting rail break/vehicle A system for detecting a rail break or train occupancy includes a current source adapted to deliver a current to an isolated block of a rail track. A voltage sensor is coupled to the isolated block and configured to detect voltage across the isolated block. A shunt ... | 09/11/2007 |
| 7226021 | System and method for detecting rail break or vehicle A rail break or vehicle detection system includes a plurality of voltage sources, each coupled to one of the plurality of zones. A plurality of resistors are provided, each coupled in series with one of the plurality of voltage sources. A plurality of current sensor... | 06/05/2007 |
| 7200470 | Train detection system and a train detection method A train detection system includes transmitters receivers connected to a track circuit for transmitting and receiving a train detecting signal to and from the track circuit, and a control device on the ground, which transmits the train detecting signal to the transmi... | 04/03/2007 |
| 7116540 | Device for inductively transmitting electrical energy A device for inductively transmitting electrical energy to at least one mobile load, with at least one primary conductor that extends along a designated path of the load in the form of a conductor loop and from which a secondary conductor arranged on the load is abl... | 10/03/2006 |
| 7027901 | Transmitter and receiver device for train detection A transmitter and receiver device used together with a control device provided on ground, which performs detection of a train, performs transmission and reception of a train detecting signal, and collates data added to a received train detection signal with predeter... | 04/11/2006 |
| 7027897 | Apparatus and method for suppressing mechanical resonance in a mass transit vehicle A mass transit vehicle traction motor control system includes an automatic control block for receiving and processing a tachometer signal having a first resonance signal superimposed thereon to produce a rate request signal having a corresponding second resonance si... | 04/11/2006 |
| 7017864 | Railway track circuits Railway track circuit apparatus for train detection comprises a track circuit transmitter and a receiver, wherein the transmitter generates a QPSK modulated signal that is transmitted into a track circuit and which is detected by the receiver. ... | 03/28/2006 |
| 6779761 | Broken rail detection A break in a rail, where two rails (12, 13) extend parallel to each other along a railway line, is detected by connecting the two rails together electrically with two electrical connections (16, 18) at opposite ends of a section of the line, causing el... | 08/24/2004 |
| 6494409 | Railway code following apparatus A solid state code following track relay receives pulsating rail current from a railway code transmitter. The track relay includes first and second inputs structured to receive the rail current. Two Hall effect digital current sensors each have a coil and... | 12/17/2002 |
| 6102340 | Broken rail detection system and method This invention relates to a system and method of detecting a broken rail in a railway system. The track sensing circuitry of the present invention applies a voltage source at each end of a block of rails and senses the current flowing through the circuitr... | 08/15/2000 |
| 5924652 | Island presence detected A reliable and consistent electrical contact path between the rails of a section of railroad track established by the shunting effect of the wheels and axles of a train is ensured by applying time-spaced, short duration electrical pulses to the rails at a... | 07/20/1999 |
| 5752677 | Block occupancy detector for model railroads This invention pertains to model railroads and specifically to the problem of detecting the presence or absence of cars, locomotives, or obstructions which may occupy a particular section of track. Modulated signals of radio frequency are applied to the t... | 05/19/1998 |
| 5720454 | Audiofrequency track circuit with data transmission (digital TC); transceiver interface A track circuit is used in a railway plant or the like, and comprises a track segment which is isolated electrically from the adjacent segments by electrical splices which consist of a conductor connecting the rails in the shape of an "S" laid flat in the... | 02/24/1998 |
| 5711497 | Cab signaling apparatus and method The invention provides for a cab signaling apparatus and method for use on board a railway vehicle propelled on a set of spaced rails by a traction motor. The cab signaling apparatus may reduce a noise component within a signal having a primary cab signal... | 01/27/1998 |
| 5680054 | Broken rail position detection using ballast electrical property measurement The position of a break in at least one of a pair of rails in an electrically isolated rail segment of a railroad is carried out by measuring current across the ballast between the rails of the segment from one end of the segment when one of the rails in ... | 10/21/1997 |
| 5470034 | Railway track circuits This invention relates to railway track circuits. An active track circuit termination unit (4) is connected to the rails and, via a transmitter unit (4a), transmits signals into the rails to terminate track circuits (A,B). The transmitter unit also transm... | 11/28/1995 |
| 5358202 | Cab signal track code analyzer system A track code analyzer is disclosed that measures the duty cycle, carrier frequency, modulation frequency, and amplitude of track code signal and determines when these parameters are outside predetermined limits. The system also detects and records transie... | 10/25/1994 |
| 5331288 | Railroad rail signal receiver having frequency conversion and a resonant tuned transformer secondary A receiver for use in receipt of signals on railroad rails which converts the rail signal to a higher frequency and feeds the higher frequency signal into an input transformer. The secondary of the input transformer is in a tuned circuit which is resonate... | 07/19/1994 |
| 5330135 | Railway track circuits A railway track circuit system is described, in which there is a transmitter 15,16 and receiver 19,20 at each end of a track circuit section 4. Each receiver receives signals from the transmitter at the opposite end of the section and the received signals... | 07/19/1994 |
| 5330134 | Railway cab signal An improved railway cab signal transmitter for transmitting a cab signal onto a pair of rails for reception by a railway vehicle on said rails. A tuning arrangement is connected across the rails to generally resonate with the leaving end impedance bond at... | 07/19/1994 |
| 5242136 | Railway signalling systems A railway signalling system for the detection of a train within a defined section of track by means of track circuit apparatus utilizes the rails within the section as part of the track circuit. The rails are electrically shunted by the wheels and axles o... | 09/07/1993 |
| 5234184 | Locomotive axle mounted cab signaling sensor A sensing device mounted on a railway locomotive vehicle axle assembly to sense signalling currents conducted through the axle. The device also serves to protect the critical traction motor support bearing from contamination by foreign substances. The sen... | 08/10/1993 |
| 5219426 | Single-element coded alternating current railway track circuit having double-element, phase-selective capability The invention provides a single-element coded alternating current railway track circuit which may be adapted to a double-element Phase-Selective configuration. A transmitter, via a transmitter transformer, provides a coded track signal to the track. A rec... | 06/15/1993 |
| 5170970 | Method and apparatus for improving rail shunts A reliable and consistent electrical contact path between the rails of a railroad track established by the shunting effect of the wheels and axles of a train is ensured by applying an alternating current signal to the rails at a voltage level sufficient t... | 12/15/1992 |
| 5145131 | Master-Satellite railway track circuit A railway track circuit for protection of an extended track block having a master unit at one end of the block and a satellite unit at the other. Each master and satellite unit having transmitting and receiving capabilities. The output impedance of the tr... | 09/08/1992 |
| 5094413 | Device for the protection of track relays from electrical disturbances A device for protecting track relays from electrical disturbances originating from a train's traction current. The device has: a control signal generator; a signal inverter, to invert periodically the polarity of the signal emitted; and a receiver for the... | 03/10/1992 |
| 5029780 | Multi-frequency railroad grade crossing termination shunt assembly A multi-frequency shunt is provided for use between the rails of a railroad track to define the approach distance for a railroad crossing using a constant warning time or motion detection device. The shunt includes a housing with a PC board having rail te... | 07/09/1991 |
| 4984521 | Conveyor control The invention is a conveyor control system having self-propelled vehicles having wheels, each driven by a motor (14) to move along rails. The system includes power rails (18) for supplying power to the vehicle (12) and at least one command rail (20, 21) w... | 01/15/1991 |
| 4979392 | Railroad track fault detector A railroad track fault detector is mounted on a tracked vehicle and uses the track ahead or behind the vehicle as a transmission line for a high frequency signal. The transmission line has a known characteristic impedance in a condition of no track fault.... | 12/25/1990 |
| 4932614 | Train communication system A communication system for a railway train has a proving circuit for proving conditions of the railway track ahead of the train. The proving circuit comprises a transponder associated with at least one rail of the track to form a rail circuit therewith. T... | 06/12/1990 |
| 4886226 | Broken rail and/or broken rail joint bar detection The apparatus of this invention is a broken rail detection system that detects rail and/or rail breaks in dark territory track sections, i.e. track sections that do not have signalling systems. In one embodiment of this invention a system is disclosed in ... | 12/12/1989 |
| 4742460 | Vehicle protection system An automatic vehicle protection system, e.g. for a railway vehicle, in which continuous contact is maintained with a train via transmissions carried by the normal track circuit signals. Information relayed to the train through these transmissions may conc... | 05/03/1988 |
| 4732355 | Rate code decoding system In railway signaling systems which transmit rate code signals along track circuits, which signals are picked up by the trains and used for signaling purposes, such as speed control, the rate code signals of the same repetition rate received when the train... | 03/22/1988 |
| 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 between the ends of the block. Either cyclically at a pre... | 03/01/1988 |
| 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 signals are alternately applied at discrete points along a pair ... | 02/09/1988 |
| 4619425 | Pulse code system for railroad track circuits An alternating current code, alternately transmitted in each direction through the rails of a railroad track section, includes a selected number of pulses of alternately positive and negative polarity similar to a bi-polar DC code. Data is transmitted by ... | 10/28/1986 |
| 4575031 | Device for detecting the unbalance between the two fractions of the return traction current in the rails of a railroad track A device for detecting the unbalance Ɗi between the two fractions of the return traction current flowing in the two rails of a railroad track, in the presence of a signalling current in the respective track circuit, includes a linear combination circuit ... | 03/11/1986 |
