(under subclass 171) Subject matter having a frangible closure for the train-pipe of an airbrake system, broken upon derailment or other condition of danger, usually by contact with the roadway, whereby the brakes are automatically applied.
SEE OR SEARCH THIS CLASS, SUBCLASS:
167, and all subclasses mentioned in the search notes
appended thereto, for cab and control features.
199, for other subject matter under subclass 167 having a frangible closure for the train-pipe.
