Noise cancellation in railway cab signal
Phase selective track circuit apparatus
Phase-controlled track circuit receiver
Plate antenna method using integral noise mitigation for railway
Positive-response transit detector for a given transit zone
Power transfer apparatus for railroad track circuits
Process and circiuit arrangement for the transmission of digital
Protective device for railroad signaling apparatus
Pulse code railway signalling system
Pulse code system for railroad track circuits
Quad state receiver
Railroad crossing motion sensing system
Railroad interlocking signal system with insulated joint failure
Railroad motion detecting and signalling system with repeater re
Railroad traffic control signaling system
Railway cab signal
Railway cab signal transmitter
Railway code following apparatus
Railway signal system
Railway signalling system