Excerpt from The Armour Engineer, Vol. 17: Published Quarterly by the College of Engineering, Armour Institute of Technology; November, 1925
For operating more than one car an automatic air brake was devised. \vith this type, triple valves take the place of engineer's valves on each car and a new type of engineer's valve is installed on a. Train line, which acts like the electric train line with the contactor system connecting through between the cars. With this arrange ment. In making an application of air, the train line is reduced. Causing the triple valve to operate and apply the brakes. To release the brakes, the train-line pressure is built up. If any cars become uncoupled or a hose be disconnected, the air is drained from the train line and the brakes make contact immediately.
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