B61L 1 - Devices along the route controlled by interaction with the vehicle or vehicle train

Patents for B61L 1 - Devices along the route controlled by interaction with the vehicle or vehicle train (1,907)
06/1976
06/29/1976	US3966148 Signal threshold responsive apparatus
06/22/1976	US3964703 Magnetic object detection
05/1976
05/25/1976	US3958781 Train vehicle protection apparatus including signal block occupancy determination
05/11/1976	US3955785 Electrical protective circuits
04/1976
04/20/1976	US3951364 Track circuit
04/13/1976	US3949959 Antenna apparatus for vehicle track rail signals
03/1976
03/02/1976	US3941338 Directional wheel detector