US PATENT SUBCLASS 246 / 51
.~.~.~.~.~ Overlapped blocks

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}
51.~.~.~.~.~ Overlapped blocks

DEFINITION

Classification: 246/51

(under subclass 46) Systems in which the signal at the entrance to any block is retained in its danger position until after a train has entered the next block ahead and has proceeded therein a certain predetermined distance.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

39, 46 to 50, 52, 53, and 60, for line-wire systems of control.