essed air then enter the high pressure cylinder. The Street Railway Company’s system. In the Hardie high pressure exhaust is heated by passing it through motor compressed air is used in a single, two-cylinder, the hot water coil, and before the reheated air enters the low pressure cylinders,… … yard truck shown in the accompanying engraving. high-pressure engine. It is carried in steel reservoirs, located under the seats of the car, and on its way from the reservoir to the motor the air is heated by passing it through a tank of hot water, stored under a pres- sure of several hundred…
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