(under the class definition) Subject matter including systems which permit a conductor, or other occupant, of a car or train to signal or communicate with the engineer, or another occupant, along the car or train.
SEE OR SEARCH THIS CLASS, SUBCLASS:
7+, for railroad-telephony systems utilized for dispatching.
SEE OR SEARCH CLASS
379, Telephonic Communications, appropriate subclasses for telephonic communication systems which may be used for communication along a train.
