(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.
