Alternating current track circuits

Antenna apparatus for vehicle track rail signals

Antenna apparatus for vehicle track rail signals

Apparatus for improved block control of train operation

Arrangement for positively determining the actual sounding of a

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)

Automatic and guided system for transporting people and...

Block occupancy detector for model railroads

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