US PATENT SUBCLASS 246 / 40
.~.~.~.~ 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}
34 R  DF  .~.~.~ Varying-current track circuit {9}
40.~.~.~.~ Single block

DEFINITION

Classification: 246/40

(under subclass 34) Systems in which the blocks are independent, trains only controlling the devices at the entrance 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.

54, and the appropriate indented subclasses for single-block systems.