US PATENT SUBCLASS 246 / 69
.~.~.~.~.~ Intermittent contact

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.~.~.~.~.~ Intermittent contact {2}
70  DF  .~.~.~.~.~.~> Rail circuit
71  DF  .~.~.~.~.~.~> Rail return

DEFINITION

Classification: 246/69

(under subclass 64) Systems in which the train-current passes out by or returns through the medium of one or more intermittent contacts or "ramp-rails", so-called.

SEE OR SEARCH THIS CLASS, SUBCLASS:

49, 56, 70, 71, 74, 85, 92, 122, 195, 229, 233, 234, and 235, for intermittent- contact systems from which cab and control

features are absent.

167+, and all subclasses mentioned in the search notes appended thereto, for cab and control features.