Combination frequency loop coupling for railway track signalling

Railway switches and signals – Block-signal systems – Automatic

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246 63R, 246122R, 246473R, B61L 2100

Patent

active

048786381

ABSTRACT:
An audio frequency (AF) track circuit whereby a railway track tuned loop transmitter operating in a dual resonant mode, for handling, two signal frequencies, can be coupled to the rails. Each frequency is conducted through a tuning unit having series and parallel branches tuned to each frequency. The track circuit using the tuned loop transmitter eliminates DC return current imbalance effects while maintaining suitably high track circuit shunting sensitivity.

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