(under the class definition) System of train-controlling means designed to prevent trains and cars from running into an open drawbridge.
SEE OR SEARCH THIS CLASS, SUBCLASS:
111+, for analogous systems of grade crossing protection.
125, 260, 293, and 473, and appropriate indented subclasses for signal structure.
SEE OR SEARCH CLASS
14, Bridges,
30, 41, 46, 55, 57, 59, 61, 63, 65, 67, and 69, for bridges having movable parts such as drawbridges and having locking devices and 49 and 50+ for gates and signals operated or controlled by the opening of the bridge.
