Assignee: Union Switch & Signal Inc.

Location: Pittsburgh, PA
No. of patents: 58

Number	Title	Issue Date
7437605	Hot standby method and apparatus An apparatus provides hot standby operation with normal and standby processors, each of which includes vital inputs electrically interconnected with the vital inputs of the other processor, vital outputs, and an application routine inputting the vital inputs and out...	10/14/2008
7395140	Geographic information system and method for monitoring dynamic train positions A geographic information system (GIS) displays geographic roadway data, geographic track data and geographic train position data. The GIS includes a GIS database having static roadway and track data. A computer aided dispatching (CAD) system includes a task to deter...	07/01/2008
7386391	Dynamic optimizing traffic planning method and system A method generates optimized traffic movement plans. A plan monitor determines a first planning boundary for traffic based upon traffic conditions of a region. A plan generator employs the first planning boundary and repetitively generates first traffic movement pla...	06/10/2008
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
7199883	System and method for sensing position of a vehicle A system determines the position of a vehicle moving responsive to an inverter having a 360 degree electrical cycle. The system includes a guideway comprising a linear synchronous motor excited by the inverter, a MAGLEV adapted to move with respect to the guideway a...	04/03/2007
6149106	Railroad switch point position indicator A fixed rail mounted railroad switch point indicator is provided, wherein proximity detectors are mounted to the fixed stock rail to sense the position of the switch relative to those stock rails. Preferably, eddy current sensors are used as the proximity...	11/21/2000
6052050	Two-wire signal transmitter and method for maintaining integrity of electrical contacts Two-wire signal transmitter and method in which a very low-level Alternating Circuit (AC) input signal sensed at a remote circuit at a first end of a signal path is added to a low-level Direct Current (DC) bias signal provided by a local circuit that is l...	04/18/2000
5922034	Programmable relay driver A programmable device driver and system thereof are provided for segregating functions and hardware in a railway signaling environment. The device driver includes a central processor with a memory and a timebase which is programmable to perform a function...	07/13/1999
5823481	Method of transferring control of a railway vehicle in a communication based signaling system A method is provided for transferring control of a railway vehicle from a controlling wayside controller that controls a first zone within which the railway vehicle was previously positioned, to an adjacent wayside controller that controls a second zone w...	10/20/1998
5812102	Vital monitoring system for seven-segment display used in railroad applications A system and method of monitoring light emitted from a light emitting diode (LED) display device, which typically has a plurality of selectively energizable display segments which are grouped to form desired shapes and/or alphanumeric characters, is provi...	09/22/1998
5791602	Plate antenna method using integral noise mitigation for railway cab signal Cab signalling apparatus for use on-board a vehicle which is propelled on tracks having a cab signal transmitted through rails. One or more plate mounted antenna is positioned above a rail to induce therein a signal representative of the cab signal curren...	08/11/1998
5785283	System and method for communicating operational status of a railway wayside to a locomotive cab A system and method of communicating via digital radio between a train and a device positioned at the wayside of a railway system, wherein the device detects defects at the wayside and information related to the defects is transmitted from the wayside to ...	07/28/1998
5764162	Micropower impulse radar based wheel detector A wheel detector for indicating the presence of a rail vehicle on a set of spaced rails is disclosed. The wheel detector transmits a radar pulse signal and samples a portion of the signal corresponding to a target area on one of the rails. The wheel detec...	06/09/1998
5747954	Highway crossing guard mechanism controller A highway crossing gate control circuit is provided which minimizes the "pumping" oscillation of a highway crossing gate arm which is driven up by a permanent magnet motor. A preferred embodiment of the control circuit utilizes a p-channel MOSFET in a pow...	05/05/1998
5746399	Car space measurement apparatus A car space measurement apparatus for tracking a rail vehicle position on a track is provided, which includes a wayside sensor and a supervisory processor. The wayside sensor senses multiple track parameters that are representative of the rail vehicle pos...	05/05/1998
5736923	Apparatus and method for sensing motionlessness in a vehicle An apparatus and method for sensing motionlessness for sensing motionlessness in a land-based vehicle is provided. The apparatus can include an inertial measurement unit (IMU) mounted in a predetermined orientation on the vehicle and a programmable comput...	04/07/1998
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
5697584	Railroad searchlight signal with solid state illuminant and aspect indication A railroad searchlight signal for producing light signals of selected colors. The searchlight uses a reflector that has an inner surface of reflective material and a focal point. One or more light emitting diodes are provided at the reflector focal point....	12/16/1997
5683148	Brake pipe pneumatic valve A brake pipe pneumatic valve attachable to an end of a railway vehicle having a first flexible air hose for transmitting brake pipe pressure, and the end-of-train device with a second flexible air hose. The valve includes a housing having first, second, a...	11/04/1997
5676337	Railway car retarder system A railway car retarder mechanism that employs linear electromagnetic induction to precisely accelerate or decelerate a railcar. The retarder mechanism includes a plurality of linear induction stators having a spaced plurality of primary inductors, a contr...	10/14/1997
5675868	Latching device for a door of a railway train stop housing A latching device is provided for releasably retaining in an upright and open position, a hinged door which is typically manufactured of a heavy cast iron and hinged to a train stop housing, thereby to prevent the unintentional and accidental closure of t...	10/14/1997
5664744	Railway highway crossing signal A railway signal having a housing, in which the housing has an annular ledge thereon. The annular ledge has first and second opposed surfaces. One or more portions of the second ledge surface, preferably cast raised bosses, are machined so as to have a se...	09/09/1997
5659137	Decelerometer A decelerometer is provided for detecting and measuring inertial deceleration and acceleration of a vehicle moving in a first direction and alternatively moving in a second direction which opposes the first direction. The decelerometer uses a tilt sensor ...	08/19/1997
5622339	Plate antenna method using integral noise mitigation for railway cab signal Cab signalling apparatus for use on-board a vehicle which is propelled on tracks having a cab signal transmitted through rails. One or more plate mounted antenna is positioned above a rail to induce therein a signal representative of the cab signal curren...	04/22/1997
5598992	Railway switch circuit controller A railway switch circuit controller having a housing with a bottom surface and opposed side surfaces. The bottom surface has a raised planar boss provided thereon, in which the raised boss is cast upon the bottom surface and is then machined so as to have...	02/04/1997
5561762	Malicious fault list generation method A method for selecting and responding to a malicious fault in a reconfigurable electronic apparatus that can perform multiple tasks, and that has fault processing for counteracting a class of faults which can generally cause the apparatus to fail during t...	10/01/1996
5547151	Railway switch mechanism A linear induction rail switch mechanism having at least one linear induction motor (LIM) for transversely thrusting a switch track from a first position to a second position. To reduce the frictional forces during transverse movement, the switch mechanis...	08/20/1996
5543596	Highway crossing gate mechanism circuit contact A rotary switch operated by a cam having a lobe is disclosed. The cam is attached to a mechanism for rotation about the axis of the cam. A first switch contact member is positioned adjacent said cam and selectively makes electrical contact with a second s...	08/06/1996
5535968	Vital railway signal link A vital railway signal link for passing DC signals between a first terminal location and a second terminal location. A transmitter at the first terminal location receives a DC input signal and responsively produces a light signal modulated at a preselecte...	07/16/1996
5529267	Railway structure hazard predictor A hazard predictor that processes both rail and superstructure measurements to predict some potentially hazardous conditions on a railway structure. Measurement is collected in real time with the aid of fiber optic sensor based linear array mesh, and proc...	06/25/1996
5527005	Swing nose frog switch point adjuster An apparatus is provided for moving a movable switch point a selected distance as a result of the throw of a switch machine. The apparatus includes an operating rod connected to and movable by the switch machine and a switch point adjuster mounted directl...	06/18/1996
5507456	Reduced harmonic switching mode apparatus and method for railroad vehicle signaling A signaling apparatus that includes a transmitter having a step-square wave generator for generating a signaling waveform, which waveform is composed of a plurality of square wave signals, and which has an information signal encoded thereupon. The apparat...	04/16/1996
5507567	System for initiating rear braking in a railway train and air sensor for use with the same A system is disclosed to selectively initiate braking at a rear section of a railway train upon initiation of a selected front braking condition at the front section of the railway vehicle. The system utilizes an air sensor preferably constructed in the f...	04/16/1996
5501417	Noise cancellation in railway cab signal A cab signaling apparatus for use on board a railway vehicle which is propelled on rail tracks by an electric drive motor. The invention utilizes a cab signal transmitted to the vehicle through a track circuit in the rails. On board receiving of the cab s...	03/26/1996
5501416	Method and apparatus for inductively receiving cab signaling on board a railway vehicle A cab signaling apparatus for use on board a railway vehicle which is propelled on rail tracks by an electric drive motor. The invention utilizes a cab signal transmitted to the vehicle through a track circuit in the rails. On board receiving of the cab s...	03/26/1996
5502367	Highway crossing control Highway crossing gate control circuit in which a permanent magnet motor is controlled to drive up and drive down the gate arm by utilization of a single motor control relay and controller contacts which sense the position of the gate arm. The motor polari...	03/26/1996
5485977	Reduced harmonic switching mode apparatus and method for railroad vehicle signaling A signaling apparatus that includes a transmitter having a step-square wave generator for generating a signaling waveform, which waveform is composed of a plurality of square wave signals, and which has an information signal encoded thereupon. The apparat...	01/23/1996
5467654	Method and apparatus for determining the operating speed of a rail vehicle The present invention provides a generally contactless method and apparatus for producing a speed reference for a rail vehicle which amenable to retrofit applications. The invention utilizes a laser source to direct a laser beam on a portion of the wheel ...	11/21/1995
5465926	Coded track circuit repeater having standby mode A coded railway track circuit apparatus is disclosed having the capability of operating during periods of low vehicle activity in a reduced power standby mode. This is accomplished by switching circuitry which interrupts power to most of the components wi...	11/14/1995
5460435	System for initiating rear braking in a railway train and air sensor for use with the same A system is disclosed to selectively initiate braking at a rear section of a railway train upon initiation of a selected front braking condition at the front section of the railway vehicle. The system utilizes an air sensor preferably constructed in the f...	10/24/1995

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Assignee: Union Switch & Signal Inc.