Track circuit

Details Track circuit Track circuit

1985-01-23

1987-02-10

Caldwell, Sr., John W.

Railway switches and signals

Block-signal systems

Automatic

246 63R, 246122R, B61L 2100

Patent

active

046418032

ABSTRACT:
A railway track circuit arrangement particularly suitable for the short track circuit, down to approximately 40 metres, required in metro transit systems. Based on conventional A.C. track signalling principles for continuous track rails, the boundaries between adjacent track sections are defined by electric separation zones. An electrical short is connected between the running rails and an A.C. signal tuning unit is connected approximately 6 metres away to tune the end loop thus formed to resonance at the selected track signal frequency. The tuning units comprise a capacitor, the value of which is selected for resonance tuning, and a transformer a winding of which is connected in series with the capacitor, and a track circuit signal transmitter or receiver is connected through a second winding of the transformer. In order to reduce mutual coupling between track circuits by longitudinal leakage, in each joint, two electrical short may be connected between the rails spaced apart approximately 0.75 metre.

REFERENCES:
patent: 3450874 (1969-06-01), Whitten
patent: 3479502 (1969-11-01), Whitten
patent: 3489892 (1970-01-01), Whitten
patent: 3526378 (1970-09-01), Thorne-Booth
patent: 3543262 (1970-11-01), Hutton
patent: 4351504 (1982-09-01), Frielwghaus
patent: 4487385 (1984-12-01), Salmon

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