Alternating current track circuits

Antenna apparatus for vehicle track rail signals

Antenna apparatus for vehicle track rail signals

Arrangement for protecting data communication in a continuous au

Audio frequency track circuit for rapid transit applications wit

Audiofrequency track circuit with data transmission (digital TC)

Broken rail detection

Broken rail/bond detectors

Cab signal control circuits for railroad interlockings

Cab signal track code analyzer system

Cab signaling apparatus and method

Cab signalling system utilizing coded track circuit signals

Car signaling system

Circuit arrangement for a track circuit with multiple signal sou

Circuit for detecting unbalance of the traction current in a tra

Code reset apparatus for railroad track circuits

Coded track circuit repeater having standby mode

Coded track circuit with diagnostic capability

Combination frequency loop coupling for railway track signalling

Communications-based vehicle control system and method