. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . broken. A Westinghouse air compressor is .shown in Fig. 7A. Storage Air Brakes. The storage air-brake system does n(»thave a .small inde|)e:;!dent compressor on each car, but ia c(|uippedwith a large .storage tank, in which air is carried under high ])res-sure—250 t(j ijOO pounds p«er .scjuare inch. This .storage tank is ELECTRIC RAILWAYS 59 filled at regular intervals when the car passes some point on itsroute at w
. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . broken. A Westinghouse air compressor is .shown in Fig. 7A. Storage Air Brakes. The storage air-brake system does n(»thave a .small inde|)e:;!dent compressor on each car, but ia c(|uippedwith a large .storage tank, in which air is carried under high ])res-sure—250 t(j ijOO pounds p«er .scjuare inch. This .storage tank is ELECTRIC RAILWAYS 59 filled at regular intervals when the car passes some point on itsroute at which a compressor is located. In this case the car isobliged to stop long enough to make connection to the tank of theccmipressor plant, and to allow the car storage tank to be operation, however, does not take long. The advantages ofthe system are a saving of the weight and a saving in the mainte-nance of a small compressor on each car. From the main storagetank under the car, air is led through a reducing valve to an auxiliarystorage tank. This reducing valve allows enough air to pass throughto maintain a pressure of about 50 pounds per scjuare inch in the. Fig. bi. Wcstiiighoiise Air Compressor. auxiliary storage tank. The auxiliary storage tank corresponds tothe regular storage tank on a system employing compressors on eachcar. The method of operation after the air has entered the auxiliarystorage tank is the same as with any air-brake system. Fig. 55 shows the arrangement of the apparatus under the carsof the St. ;ouis Transit rom})any. The two storage tanks areeach G feet long by 18 inches in diameter and are mounted one oneach side of the car. Their combined capacity is equivalent to about100 cubic feet at 45 lbs. pressure. The tanks are charged throughan outlet near one side of the car. This outlet contains a checkvalve and cock to prevent leakage. The service or low pressure reservoir has a capacity of about2j cubic feet. The position of the reduci
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