US PATENT SUBCLASS 246 / 42
.~.~.~.~ Propulsion-current return

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}
41  DF  .~.~.~ Direct current, normally closed, track circuit {4}
42.~.~.~.~ Propulsion-current return {1}
43  DF  .~.~.~.~.~> Varying

DEFINITION

Classification: 246/42

(under subclass 41) Systems in which a direct propulsion-current is returned by and super-imposed upon one or both of the track-rails in which the signal controlling current flows.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

35+, 43 and 61, for superimposed propulsion-current.