B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
346/64
B61L 3/06 (2006.01) B61L 3/22 (2006.01)
Patent
CA 1077612
TRANSMITTING LOOP ARRANGEMENT FOR RAILROAD CAB SIGNAL AND SPEED CONTROL SYSTEM ABSTRACT OF THE DISCLOSURE A wire loop for carrying cab signal or speed control commands is laid parallel to the rails along the track center line except at the exit end of each section where an offset portion of this loop is laid immediately adjacent one rail to form a cut-in signal source. A second loop is laid along the center line of the rails through this offset distance, which is equal to the stopping distance of the train from the restricted speed rate, and each loop is supplied by the same cab signal transmitter. Each train carries receiver coils positioned above the center line loops and above the cut-in loop positions. The normal cab signal or speed control apparatus is controlled by the signal picked up by the receiver coil above the center- line loops in the track. A separate cut-in receiver is controlled by signals picked up from the offset portion of the main loop but responds only to a proceed signal command. Interruption of signal transmission to the second loop when the advance track section is occupied halts a train moving in the approach section and cuts off the cab signal apparatus by interrupting a stick circuit of a cab signal control relay. When the cut-in receiver again responds to a proceed signal command, transmitted after the advance track section is again unoccupied, it energizes a cut-in relay which picks up the cab signal relay to again complete its stick circuit and activate the normal cab signal apparatus.
281124
Bourke Thomas J.
Buzzard Kenneth J.
Bourke Thomas J.
Buzzard Kenneth J.
Westinghouse Air Brake Company
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