Railway control signal interlocking systems

Details Railway control signal interlocking systems Railway control signal interlocking systems

1979-05-23

1981-06-02

Eisenzopf, Reinhard J.

Railway switches and signals

Train dispatching

Central signal control

371 36, B61L 2700

Patent

active

042707153

ABSTRACT:
The specification discloses an electronic or computer-based railway control signal interlocking system. Signals representing the settings or conditions of railway control elements e.g. track circuits, signals and points, and their control signals are checked as usual by the interlock equipment to establish route safety. However failures in the system may only be discovered when a change to a control element setting is attempted. Since long periods can elapse between changes a failure may lie dormant for some time. In order to reduce dormant wrong side failure periods to a minimum the signals supplied to the interlocking equipment are periodically switched to a predetermined state chosen to prove that when the interlocking equipment receives the switched signal that a wrong side failure mode does not exist in the switched signal path.

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

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