Signal control system
AssigneeSafetran Systems Corporation
InventorH. James Wilson
Life of this patent
Estimating the term…
Abstract
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 transmitter 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 provides an A type DC message and the B transmitter provides 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.
Claims7
A railroad signaling system including an A transmitter and A receiver for sending and receiving signal messages in one direction and a B transmitter and B receiver for sensing and receiving signal messages in the opposite direction,
- said A transmitter and B receiver being located at one end of a signal block and said B transmitter and A receiver being located at the other end,
- said A transmitter including means for providing an A type DC message, said B transmitter including means for providing a B type DC message, said A receiver being responsive to only an A type message and said B receiver being responsive to only a B type message, both said A and B type messages including address portions having different pulse characteristics providing directional information,
- each of said A and B type receivers including means for inhibiting said B and A type transmitters, respectively, whereby only one transmitter operates at a time.
Dependencies are inferred from the claim text.