US PATENT SUBCLASS 246 / 71
.~.~.~.~.~.~ Rail 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}
62  DF  .~.~.~ Cab signal or train control {7}
64  DF  .~.~.~.~ Train-carried current supply {3}
69  DF  .~.~.~.~.~ Intermittent contact {2}
71.~.~.~.~.~.~ Rail return

DEFINITION

Classification: 246/71

(under subclass 69) Systems in which the traction-rails form part of the circuit, the current passing through them in one direction only.

SEE OR SEARCH THIS CLASS, SUBCLASS:

49, 56, 69, 70, 85, 92, 122, 195, 229, 233, 234, and 235, for intermittent-contact systems from which cab and control features are absent.