US PATENT SUBCLASS 246 / 36
.~.~.~.~.~ Double rail

Current as of: June, 1999
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246 /   HD   RAILWAY SWITCHES AND SIGNALS

20  DF  BLOCK-SIGNAL SYSTEMS {4}
27  DF  .~ Automatic {5}
28 R  DF  .~.~ Electric {18}
34 R  DF  .~.~.~ Varying-current track circuit {9}
35  DF  .~.~.~.~ Propulsion-current return {1}
36.~.~.~.~.~ Double rail {1}
37  DF  .~.~.~.~.~.~> Impedance bond

DEFINITION

Classification: 246/36

(under subclass 35) Systems in which both traction rails are used for the return of the super-imposed propulsion current, neither rail being sectionalized.

SEE OR SEARCH THIS CLASS, SUBCLASS:

26, 34+, 41+, 58+, 95, 98, 128+, and 130, for track-circuit systems.

35, and 37, for superposition of propulsion-current on an alternating or varying track-circuit current.

42, 43 and 61, for the superposition of propulsion-current on a direct track-circuit current.