(under subclass 192) Subject matter having frangible devices, usually closures, for train-pipes which are broken by contact with track-detents and so either vent the train-pipe of the air-brake system or actuate stop or signal mechanism, their fracture indicating that a signal has been disregarded.
SEE OR SEARCH THIS CLASS, SUBCLASS:
107, 123 and 185, for recording devices indicating the disregard of signals.
167, and all subclasses mentioned in the search notes appended thereto, for cab and control features.
172, for frangible pipe-closures which are broken by the derailment of one or more wheels.
