. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . ssenger trains, itsobject being to furnish a means of communication between thetrainmen and enginemen. The most common form used is thepneumatic, and is made up of the following principal parts: (1) A I-inch signal pipe, which extends throughout tlie length ofthe train, being connected between cars by flexible hose andsuitable couplings. (2) A reducing valve, which is located on the engine, and wliich 166 AIR BRAKES feeds air from the main reservoir into the
. Air brakes, an up-to-date treatise on the Westinghouse air brake as designed for passenger and freight service and for electric cars . ssenger trains, itsobject being to furnish a means of communication between thetrainmen and enginemen. The most common form used is thepneumatic, and is made up of the following principal parts: (1) A I-inch signal pipe, which extends throughout tlie length ofthe train, being connected between cars by flexible hose andsuitable couplings. (2) A reducing valve, which is located on the engine, and wliich 166 AIR BRAKES feeds air from the main reservoir into the signal pipe at 40pounds pressure. (3) A signal valve and whistle, ^feftCS^L^^^^ ^>^/located in the cab and con-nected to the signal pipe. (4) A car discharge valve, lo-cated on each car and con-nected to the signal action of the signal system is automatic. If an acci-dent happens to the train whichbreaks the signal pipe, the pres-sure in the signal pipe is reducedand the whistle in the cab blowsa blast. The trainmen may alsosignal the enginemen by openingthe car discharge valve, which reduces the pressure in the signal. Fig. 133. Section through Reducing Valvein Westinghouse Air-Signal System To W/7istle.
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