B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
346/46
B61L 1/00 (2006.01) B61L 23/16 (2006.01)
Patent
CA 1279921
ABSTRACT OF THE INVENTION A center-fed track circuit arrangement for an electrified section of railroad track. A first and a second remotely located insulated joint defining the limits of the track circuit. A first impedance bond connected across the rails of the railroad track in the vicinity of the first remotely located insulated joint. A second impedance bond connected across the rails of the railroad track in the vicinity of the second remotely located insulated joint. A third impedance bond connected across the rails of the railroad tracks intermediate the first and second remotely located insulated joints. Each of the first and second impedance bonds includes a center tapped winding for accommodating propulsion current. A pair of tuned windings for accommodating at least two train detection signals having different frequencies. An untuned winding for exhibiting a low impedance at the frequency of a cab signal so as to mitigate leakage current across a broken-down insulated joint.
536890
Fetherstonhaugh & Co.
Union Switch & Signal Inc.
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