US PATENT SUBCLASS 246 / 57
.~.~.~.~.~.~ 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}
54  DF  .~.~.~.~ Single block {1}
55  DF  .~.~.~.~.~ Cab signal or train control {2}
57.~.~.~.~.~.~ Bridged insulated rail joint

DEFINITION

Classification: 246/57

(under subclass 55) Systems in which an electric circuit upon the train, normally closed through the track rail or rails, is broken by the passage of the car over one or move insulated rail-joints, the break in the rails being electrically closed under conditions of safety.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

40, for single-block systems.

48, 75 and 179, for bridged-insulated-rail-joint systems.

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