Vital railway signal link

Details Vital railway signal link Vital railway signal link

1992-07-27

1996-07-16

Safourek, Benedict V.

Railway switches and signals

Train dispatching

Central signal control

330306, 359176, B61L 2700

Patent

active

055359680

ABSTRACT:
A vital railway signal link for passing DC signals between a first terminal location and a second terminal location. A transmitter at the first terminal location receives a DC input signal and responsively produces a light signal modulated at a preselected frequency. The light signal is conducted through an optical fiber to the second terminal location. There, a receiver detects the light signal and produces a DC output signal. The receiver contains discriminator circuitry preferably including a bandpass filter to prevent light signals other than those modulated at the preselected frequency from giving an output signal.

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