Railroad signal control system

Details Railroad signal control system Railroad signal control system

B - Operations, Transporting

61

L

346/38

B61L 3/12 (2006.01) B61L 23/04 (2006.01) B61L 23/16 (2006.01)

Patent

CA 1138972

ABSTRACT OF THE DISCLOSURE A railroad signal system includes an A type transmitter and receiver for sending and receiving signal messages in one direction and a B type transmitter and receiver for sending and receiving signal messages in the opposite direction. The A trans- mitter and the B receiver are located at one end of a signal block and the B transmitter and A receiver are located at the opposite end. The A transmitter includes means for providing an A type DC message and the B transmitter includes means for providing a B type DC message. The A receiver is responsive to only an A type message and the B receiver is responsive to only a B type message.

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