. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . Truck of the Single-Truck Car. further illustrated by the sketches showTi in Fig. general dimensions and data are the following: Gage of wheels 4 feet inches. Height of side sills above rail without car body . inches Wheel base 7 feet. AVeight of truck .... 6,500 pounds. Axles, diameter at center. 4 , diameter at wheel seat inches. Type of motor suspension, nose. Wheels, cast iron, diameter 33 inches. Journals inches by inches. Some of Motors. The dri
. Report of the Electric Railway Test Commission to the president of the Louisiana Purchase Exposition . Truck of the Single-Truck Car. further illustrated by the sketches showTi in Fig. general dimensions and data are the following: Gage of wheels 4 feet inches. Height of side sills above rail without car body . inches Wheel base 7 feet. AVeight of truck .... 6,500 pounds. Axles, diameter at center. 4 , diameter at wheel seat inches. Type of motor suspension, nose. Wheels, cast iron, diameter 33 inches. Journals inches by inches. Some of Motors. The driving equipment consisted of two Westinghouse motors. The Westinghouse Company recommends thisequipment for city service for the operation of either single ordouble-truck cars of any size up to 35 or 40 feet over all, andweighing, without equipment or load, from 23,000 to 30,000pounds. As previously stated, the car under consideration hada gross w^eight, without load, of 24,665 pounds. The manu-facturers further state that in city service, with runs averaging i2 ELECTRIC RAILWAY TEST COMMISSION. SERVICE TESTS OF ELECTRIC CARS 43 from one eighth to one quarter of a mile in length, the equip-ment with a gear ratio of from 14 to 68 or 16 to 66, will producean ultimate speed of from 18 to 20 miles per hour approximately,on a straight level track with a line pressure of 500 volts. The gear ratio on the car tested was 18 to 64, and the lengthof run averaged 790 feet, or about of a mile. The ultimatespeed reached in the tests was approximately 21 miles per general view of this type of motor is shown in Fig. 7.
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