Railway switches and signals – Block-signal systems – Automatic
Patent
1987-01-12
1989-11-07
Basinger, Sherman D.
Railway switches and signals
Block-signal systems
Automatic
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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Frielinghaus Klaus H.
Hoelscher James R.
Raso Frank A.
Smith Barry L.
Avila Stephen P.
Basinger Sherman D.
General Signal Corporation
Lukacher Martin
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