Railway switches and signals – Block-signal systems – Automatic
Patent
1986-06-26
1988-02-09
Caldwell, Sr., John W.
Railway switches and signals
Block-signal systems
Automatic
246 37, B61L 100
Patent
active
047237384
ABSTRACT:
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.
REFERENCES:
patent: 1770705 (1930-07-01), Lucas
patent: 2854567 (1958-09-01), Staples et al.
patent: 4053128 (1977-10-01), Frielinghaus et al.
American Standard Inc.
Caldwell Sr. John W.
Oberley Alvin
Sotak J. B.
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