Railway switches and signals – Electric actuation – Switch signals
Patent
1997-03-12
1998-09-15
Le, Mark Tuan
Railway switches and signals
Electric actuation
Switch signals
246253, 246476, B61L 500
Patent
active
058068090
ABSTRACT:
A switch point position detecting system and method uses a plurality of proximity detectors positioned proximate the switch point or points of a railroad switch. Additional proximity detectors are placed within a switch machine housing to detect the position of components therein, such as lock rods and lock bars. One or more Programmable Logic Controllers (PLC's) have inputs connected to the proximity detectors and outputs connected to relays or switches which control the switch machine and signals. The PLC's are programmed to operate the relays to give signals to proceed only when correct indications are received from all effected proximity detectors.
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General Railway Signal's Installation, Operation and Maintenance Pamphlet 1293, published Feb., 1987, for Electric Switch Machines.
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