Track circuits with cab signals for dual gage railroads

Details Track circuits with cab signals for dual gage railroads Track circuits with cab signals for dual gage railroads

B - Operations, Transporting

61

L

346/30

B61L 27/04 (2006.01) B61L 1/18 (2006.01)

Patent

CA 1076242

(Case No. 6728) TRACK CIRCUITS WITH CAB SIGNALS FOR DUAL GAGE RAILROADS ABSTRACT OF THE DISCLOSURE Alternating current track circuit energy for train detec- tion and cab signals is coupled to the exit end of an insulated, dual gage track section between the common rail and the other two rails connected in parallel. The track relay is connected at the entrance end in a similar manner. Impedance bonds for direct current propulsion are also connected between the com- mon rail and the other two rails at each end. In all forms, the propulsion return current is sufficiently balanced between the three rails to eliminate cab signal interference in either gage. In a first arrangement, a direct wire connection multi- ples the two other rails at each end, Impedance bond taps to complete the return circuit provide a two to one turn ratio from the common rail end of the bond winding to equalize the propulsion current ampere turns on each side of the tap and thus balance the flux generated, In a second form, the short end of the impedance bond has two windings with an equal number of turns but each only one-half of the larger end turns. Each short end is connected to one of the other rails to again bal- ance the total ampere turns on each side of the winding tap. In a third form, the other rails are coupled at each end of the section by an L-C circuit path with track circuit energy and the track relay connected between the common rail and the junc- tion between the L and C elements, A center tapped impedance bond is connected in a conventional manner between the common and narrow gage rails at each end with a resistive impedance path connected between the tap and the broad gage rail.

272863

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