Railroad crossing motion sensing system

Details Railroad crossing motion sensing system Railroad crossing motion sensing system

1975-04-17

1976-03-16

Blix, Trygve M.

Railway switches and signals

Block-signal systems

Automatic

246128, B61L 2106

Patent

active

039441733

ABSTRACT:
An apparatus for detecting an approaching train within a track section utilizes a transmitter coupled to the rails at a feed point for applying a current to the track section. There is a receiver coupled to the track section for producing a signal representative of the impedance of the track section. There are devices for utilizing the received signal for detecting train motion, abnormally low impedance and abnormally high impedance of the track section. A normalizer circuit is connected to the receiver for increasing or decreasing the received signal gain within predetermined limits in accordance with variation in impedance of the track section.

REFERENCES:
patent: 3390256 (1968-06-01), Clanton
patent: 3777139 (1973-12-01), Peel
patent: 3850390 (1974-11-01), Geiger

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