Railway control signal dynamic output interlocking systems

Details Railway control signal dynamic output interlocking systems Railway control signal dynamic output interlocking systems

1979-05-23

1981-12-15

Miller, J. D.

Railway switches and signals

Train dispatching

Central signal control

246167R, 324 73R, B61L 2700

Patent

active

043055567

ABSTRACT:
A computer based railway interlocking control system, having triple parallel redundant control computers (FIG. 2) provides greater system reliability as compared to a single computer system. The railway traffic control devices, e.g. points and signals, are arranged to be controlled by signals in one of two possible steady states, the interlocking control means (30, 31, 32, FIG. 2) is arranged to produce control signals in the steady state for de-energized or "safe" device settings and in an alternating state for energized or potentially "unsafe" settings. The alternating control signals (33, 34, 35 or 38) must be converted to the corresponding steady state to operate the devices thus, the converting or restoring circuit discriminates against dormant wrong side failures, i.e. "unsafe" signals to increase the inherent safety of the system.

REFERENCES:
patent: 3783250 (1974-01-01), Fletcher et al.

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