Dual signal frequency motion monitor and broken rail detector

Details Dual signal frequency motion monitor and broken rail detector Dual signal frequency motion monitor and broken rail detector

B - Operations, Transporting

61

L

346/31

B61L 29/30 (2006.01) B61L 23/04 (2006.01) B61L 29/32 (2006.01)

Patent

CA 1162630

(Case No. 7073) ABSTRACT OF THE DISCLOSURE A highway crossing warning system for monitoring the motion and predicting the time of arrival of an approaching train at the highway crossing and for detecting the presence of a broken rail in the approach zone by feeding dual fre- quency signals into the track rails and measuring the track impedances at the two frequencies and the phase angle of the lower of the two frequencies.

371518

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