Abstract: A system includes one or more processors configured to identify first location data corresponding to a first location of a first vehicle of a vehicle system when the first vehicle passes a reference object and identify second location data corresponding to a second location of a second vehicle of the vehicle system. The one or more processors are further configured to determine whether the first location and the second location are within a predetermined distance of each other and in response to determining that the first and second locations are within the predetermined distance of each other, and generate a signal related to a condition that the first location and the second location are within the predetermined distance.

Abstract: A system includes one or more processors configured to identify first location data corresponding to a first location of a first vehicle of a vehicle system when the first vehicle passes a reference object and identify second location data corresponding to a second location of a second vehicle of the vehicle system. The one or more processors are further configured to determine whether the first location and the second location are within a predetermined distance of each other and in response to determining that the first and second locations are within the predetermined distance of each other, and generate a signal related to a condition that the first location and the second location are within the predetermined distance.

Abstract: A method of determining when a first train has cleared an intersection a distance to permit travel of a second train through the intersection without risk of collision or contact includes: (a) sampling first GPS data corresponding to a location of a lead vehicle of the first train travelling on a first track when the lead vehicle passes proximate a marker; (b) sampling second GPS data corresponding to a location of a last vehicle of the first train moving on the first track; (c) comparing the second GPS data and the first GPS data: (d) repeating steps (b)-(c) until the location corresponding to the first GPS data and the location corresponding to the second GPS data are within a predetermined distance of each other, and (e) generating a signal when the locations are within the predetermined distance.

Abstract: A method of determining when a first train has cleared an intersection a distance to permit travel of a second train through the intersection without risk of collision or contact includes: (a) sampling first GPS data corresponding to a location of a lead vehicle of the first train travelling on a first track when the lead vehicle passes proximate a marker; (b) sampling second GPS data corresponding to a location of a last vehicle of the first train moving on the first track; (c) comparing the second GPS data and the first GPS data: (d) repeating steps (b)-(c) until the location corresponding to the first GPS data and the location corresponding to the second GPS data are within a predetermined distance of each other, and (e) generating a signal when the locations are within the predetermined distance.

Abstract: An electronic control for a locomotive airbrake featuring field replaceable control portions having a minimum of pneumatic and electrical connections which are controlled by a redundant, distributed network of microprocessors.

Abstract: An improvement on locomotive bubble-type fuel level measuring systems tests or monitors the integrity of the bubble-type pneumatic system by observing the rate of bubble formation, in addition to gauging fuel level. A bubble-type fuel level detection system bubbles a volume of air through a bubble tube. As air exits from the bottom of the tube, bubbles form in the fuel. These bubbles cause small variations in back-pressure in the tube as each bubble grows in size and eventually breaks free from the opening in the tube. The frequency these variations is proportional to the airflow or bubble rate at the bottom of the bubble tube such that pneumatic leaks or other problems can be detected by declaring a problem condition if the bubble rate falls below a predetermined threshold.

Abstract: An anti-stall motor drive circuit for a very slow running permanent magnet d.c. motor is disclosed. The slow running speed of the motor sometimes allows an insulating film to build up between the brushes and the commutator which causes the stalled condition. The motor (10) is connected in the collector circuit of a drive transistor (Q1) which has a current limiting resistor (R9) connected in its emitter circuit. A stalled condition of the motor (10) is sensed by a lack of output from a tachometer (16) output. The output of the tachometer is full wave rectified by an operational amplifier (22) and diodes (CR1 and CR2). The rectified tachometer voltage is applied to an integrator (24 and C1) having a clamping diode (CR7) connected in its feedback circuit. A zero output from the rectifier allows the integrator output to ramp up to a limiting value determined by the clamping diode.