US PATENT SUBCLASS 246 / 26
.~.~.~.~ Track-circuit control

Current as of: June, 1999
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246 /   HD   RAILWAY SWITCHES AND SIGNALS

20  DF  BLOCK-SIGNAL SYSTEMS {4}
21  DF  .~ Semi-automatic {1}
22  DF  .~.~ Electromanual {3}
25  DF  .~.~.~ Lock and block {1}
26.~.~.~.~ Track-circuit control

DEFINITION

Classification: 246/26

(under subclass 25) Systems in which track circuits are used for controlling the devices of the system.

SEE OR SEARCH THIS CLASS, SUBCLASS:

34, 41, 58, 95, and 98, for block-signaling systems having specific track circuits.

128+, and 130, for automatic-highway signal systems, mine door and/or gate systems having specific track circuits.