Electronic railroad track marker system

Details Electronic railroad track marker system Electronic railroad track marker system

1976-08-05

1977-08-09

Habecker, Thomas B.

Communications: electrical

Selective

Having indication or alarm

246167R, G08C 2500, G08C 2100

Patent

active

040414485

ABSTRACT:
A locomotive is fitted with a transmit and a receive coil. Resonant circuits are packaged within a housing that is secured at a preselected point along a railroad track to serve as a position marker. When the locomotive passes the marker, a signal is coupled from the transmit coil in the locomotive to the marker resonant circuit and back to the receiver coil in the locomotive. Discrimination circuitry is connected to the receive coil for ensuring that the received signal has a minimum amplitude and a particular phase relationship with the signal in the transmit coil. Further, the received signal must maintain these amplitude and phase relationships for a preselected count. Upon proper discrimination, a "mark" signal is generated to an event recorder on board the locomotive.

REFERENCES:
patent: 3701102 (1972-10-01), Berman

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