B - Operations – Transporting – 61 – L
Patent
B - Operations, Transporting
61
L
346/49
B61L 25/02 (2006.01) B61L 1/18 (2006.01) B61L 7/10 (2006.01)
Patent
CA 1038484
ABSTRACT OF THE DISCLOSURE TRACK CIRCUIT There is described a track circuit for use with a track section which may or may not include a switch. The circuit provides means for detecting the presence of a rail- road vehicle within the track sections as it constitutes a shunt across the track. The track section is divided into a plurality of segments with each segment having a common bounda- ry with at least one other segment. Alternating current sig- nals are induced into each track segment and sensing means are provided for responding to the induced a.c. signals. Modulating means are provided for intermittently affecting the signal sensed by the sensing means and a detecting means is provided for detect- ing and responding to the changing signal sensed by the sensing means. The detected signals are gated through a logic circuit which provides first and second outputs indicating: the changes are as might be anticipated as a result of the modulation intro- duced; or, that the changes are other than might be anticipated as a result of the modulation, respectively. The shunting effect of a railroad vehicle in any segment will cause the production of the second type of output signal and, therefore, the second type of output signal is an indication of a railroad vehicle within the track section.
240875
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