Abstract: A mount base has two movable arms with jaws mounted thereon for engaging the coupler head surface adjacent and interior of the relief or core holes formed in the head. The arms are operated upwardly and downwardly via a pair of scissor links that are opened and closed by way of a threaded rod mounted between the mount base and a link carrier that moves forwardly to open the jaws for engaging the holes and rearwardly to close the jaws for disengaging from the coupler head. The device is designed to engage either of two pairs of the vertically disposed spaced holes. The mount base is adapted to carry signaling and monitoring equipment that is required on the last car of a railroad train.

Abstract: A mount base has two movable arms with jaws mounted thereon for engaging the coupler head surface adjacent and interior of the relief or core holes formed in the head. The arms are operated upwardly and downwardly via a pair of scissor links that are opened and closed by way of a threaded rod mounted between the mount base and a link carrier that moves forwardly to open the jaws for engaging the holes and rearwardly to close the jaws for disengaging from the coupler head. The device is designed to engage either of two pairs of the vertically disposed spaced holes. The mount base is adapted to carry signaling and monitoring equipment that is required on the last car of a railroad train.

Abstract: A signal comparator receives switch-created signals from two stations manned by an engineer and a trainman in a locomotive and compares the signals for a match. The signals are an implementation and acknowledgement of wayside signals. One station is used to acknowledge a signal and unless a match is determined by the other operator entering the same acknowledgement within a preset time interval the system will automatically stop the train. Alarm functions and speed monitoring functions based on matched station signals are also provided. The system is automatically activated anytime a switch is operated or the speed of the train exceeds 15 mph. Signal matching is also required at period time intervals. If such acknowledgement is not forthcoming, the system assumes crew incapacitation and will automatically stop the train.

Abstract: A telemetry receiver which is capable of automatically recognizing certain incompatible code formats and correctly decoding received data from a remotely located telemetry transmitter is disclosed. The specific embodiment is an end of train receiver mounted in the cab of a locomotive which receives encoded transmissions, including encoded brake pipe pressure data, a transmitter mounted on the last car of a train. The receiver permits telemetry equipment to be "mixed-and-matched"; that is, the receiver in the locomotive will respond to the transmissions of a telemetry transmitter attached to the last car of the train no matter what the vendor source. The telemetry receiver is provided with a microprocessor which analyzes the received transmission. The microprocessor is programmed to recognize certain known transmission protocols and formats and then invoke the correct routine for decoding the received data.

Abstract: A gravity operated switching circuit, having particular application in end of train equipment, allows the microprocessor circuit board in the equipment to be turned off. The circuit turns the power off when the equipment is laid on its side after a predetermined time constant, and when the equipment is again mounted in an upright position, the power is turned on after a different predetermined time constant. A modification of the basic circuit requires a reset button to be manually pressed to restore power after the equipment is again mounted in an upright position.

Abstract: An improved automatic train-line air brake pressure monitoring system includes circuits that emulate an automatic brake valve and cause an automatic brake manifold release whenever a four psi increase in pressure is sensed. The system includes a pressure sensor amplifier (10) which provides a signal proportional to the sensed pressure in a brake pipe. This signal is tracked by a peak hold circuit (12) that stores the peak value of the signal. The output of the sensor amplifier is subtracted from the output of the peak hold circuit in a subtractor (14) to provide a difference signal. The difference signal is tracked by a reduction hold circuit (22) which stores the minimum value of the difference output from the subtractor. An increase in measured pressure from the stored minimum value is compared in a comparator (24) with a reference value representing the four psi level, and when the increased pressure exceeds the reference value, a system reset is generated.

Abstract: In an automatic train-line air brake pressure monitoring system, a peak detector and hold circuit determines the peak voltage of an input signal representing the air pressure in the air brake system. A signal representing the present peak voltage of the input signal from the previously detected peak voltage is subtracted from the presently detected peak voltage to provide a subtraction output signal such that signals representative of the air brake pressure can be generated. The monitoring system may provide emergency air brake condition signals, as well as a number of programmable monitoring signals representative of different pressures within the air brake pressure system.