US PATENT SUBCLASS 246 / 54
.~.~.~.~ Single block

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.~.~.~.~ Single block {1}
55  DF  .~.~.~.~.~> Cab signal or train control {2}

DEFINITION

Classification: 246/54

(under subclass 41) Systems in which the blocks are independent, trains only controlling the devices of the blocks in which they are running.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

40, for single-block systems.