Train detection on steam worked lines uses relay across rails which is shorted out by train; power considerations normally restrict rail voltage to 0.3 v; in certain circumstances this voltage is insufficient to rupture insulating surface films on wheels and rails and train is not detected; system is described which uses 20 v pulses generated by transistor circuit, and detects vehicles not detected by 0.3 v system.
Pulse track-circuit system
Brit Communications Electronics
British Communications and Electronics ; 8 , n 8
1961
4 pages
Article (Journal)
English
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