US PATENT SUBCLASS 246 / 58
.~.~.~ Direct-current, normally open, track circuit

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}
58.~.~.~ Direct-current, normally open, track circuit {2}
59  DF  .~.~.~.~> Cab signal or train control
60  DF  .~.~.~.~> Distant-signal control

DEFINITION

Classification: 246/58

(under subclass 28) Systems in which a direct continuous current used for actuating and controlling traffic-controlling devices, normally open and derived from a source not on the train, uses both traction-rails in series as conductors in opposite directions for the major portion of the block.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

449, 450 and 451, for tie-bars with insulated joints.

SEE OR SEARCH CLASS

238, Railways: Surface Track,

14.1+, for the structure of rail-bonds and subclass 152, for insulated rail-joints.