US PATENT SUBCLASS 246 / 48
.~.~.~.~.~.~ Bridged insulated rail joint

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}
46  DF  .~.~.~.~ Line-wire distant control {5}
47  DF  .~.~.~.~.~ Cab signal or train control {2}
48.~.~.~.~.~.~ Bridged insulated rail joint

DEFINITION

Classification: 246/48

(under subclass 47) Systems in which an electric circuit on the train, normally closed through the track-rails, is broken by the passage of the train over one or more insulated rail-joints when a condition of danger exists, the break in the rails being electrically bridged under conditions of safety.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

39, 46, 49 to 53 and 60, for line-wire systems of control.

57, 75 and 179, for bridged-insulated-rail-joint systems.

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