US PATENT SUBCLASS 246 / 61
.~.~.~ Superimposed propulsion current

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}
61.~.~.~ Superimposed propulsion current

DEFINITION

Classification: 246/61

(under subclass 28) Propulsion-current is superimposed upon the current controlling the signals.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

35, 36, 37, 42, and 43, for propulsion-current superimposed upon track-circuits.