. Electric railways, theoretically and practically treated . (Chain Drive.)Fig. 154. —AIR COMPRESSOR. (West. Traction Brake Co.) BRAKES AND BRAKING. 249 tanks on the cars with this compressed air. In servicethe air is taken from these tanks at ordinary main reser-. Fig. 155. —AIR COMPRESSOR AXLE DRIVER. (West. Traction Brake Co.) voir pressure by means of reducing valves. The othersource of supply of compressed air which should be men-

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