Bridged Insulated Rail Joint Patents (Class 246/57)
  • Patent number: 4022408
    Abstract: Alternating current track circuit energy for train detection 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 common 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 multiples 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.
    Type: Grant
    Filed: March 3, 1976
    Date of Patent: May 10, 1977
    Assignee: Westinghouse Air Brake Company
    Inventor: Crawford E. Staples