Communicating vital control signals

Details Communicating vital control signals Communicating vital control signals

1987-08-04

1988-04-05

Chambers, A. Michael

Railway switches and signals

Train dispatching

Central signal control

246122R, 246167R, B61L 302

Patent

active

047353830

ABSTRACT:
A railway vehicle control system comprises a railway track (1) and a plurality of transponders (N, N+1, N+2) at predetermined positions along the track. A railway vehicle (2) moves along the track, the vehicle having means (20, 21) for detecting each of the transponders. A control location has means (4, 5, 6, 7, 7a) for periodically transmitting vital safety signalling information to the vehicle via a radio link. In response to detection of one of the transponders, the vehicle sends a first message via the link to the control location and in response to reception of the first message by the control location, the vital safety signalling information is sent a first time from the control location to the vehicle via the link, then from the vehicle to the control location via the link and then a second time from the control location to the vehicle via the link.

REFERENCES:
patent: 3888437 (1975-06-01), Birhin
patent: 3937432 (1976-02-01), Birhin
patent: 4015082 (1977-03-01), Matty et al.
patent: 4040053 (1977-08-01), Olsson

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