US PATENT SUBCLASS 246 / 3
.~ Central signal control


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

2 R  DF  TRAIN DISPATCHING {7}
3.~ Central signal control {2}
4  DF  .~.~> Cab signal or train control
5  DF  .~.~> Selective


DEFINITION

Classification: 246/3

(under subclass 2) Systems and devices in which the train-dispatcher can set or control the operation of

railway-traffic-controlling devices from a distance.

SEE OR SEARCH THIS CLASS, SUBCLASS:

135, 137, 141, 142, and 162, for indication that the signals, switches, etc., are properly actuated.

SEE OR SEARCH CLASS

340, Communications: Electrical,

298, for signal box systems having answer back or return call provision, and subclasses 313+ for miscellaneous signaling systems having answer back provision. 379, Telephonic Communications,

418, for telephone-call systems having a return call indicator or answer back.