File:The Street railway journal (1907) (14761353042).jpg

Identifier: streetrailwayjo291907newy (find matches)
Title: The Street railway journal
Year: 1884 (1880s)
Authors:
Subjects: Street-railroads Electric railroads Transportation
Publisher: New York : McGraw Pub. Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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Text Appearing Before Image:
FIG. 13.—ALTERNATING-CURRENT LOCOMOTIVE MOTOR-GENERATOR COMBINATION, WITH INDEPENDENT TENDER possibilities of direct-current gearless and geared motors,the former of the bi-polar type, for the same service, a verysevere one. Both machines are of the four-axle, bogie-truck type, thetrucks being linked together. The geared locomotive. Fig.10, weighs 93 tons and the gearless, Fig. 11, 126 tons, butthe weight per axle is well within the usual allowance. On use either on direct current or with a motor-generator setsupplied from, an alternating-current trolley. This machineis of the four-axle free-bogie type, the drawbar pull beingtaken through the main frame. On each truck, and form-ing an integral part with it, are two bi-polar gearless mo-tors driving the middle pair of axles, and at either end ofeach truck is a pair of leading wheels of similar diameter.
Text Appearing After Image:
FIG. 14,—160-TON LOCOMOTIVE WITH MOTOR-GENERATOR SET CARRIED IN THE CAB each truck are four motors, connected two in series, to beoperated at a maximum line potential of 1500 volts. Thegeared motor construction is of the usual standard, butfitted with commutating poles, while .the gearless machinehas modified bi-polar motors of the New York Central type.A comparison of the efficiency curves of the two ma-chines is interesting, these showing for each from 87 to88 per cent on a five-hour load, and falling only to 83 percent with 50 per cent increase, while at half this load theefficiency of the gearless machine is much higher than thatof the geared. Some adequate idea of the capacity of thegearless machine may be gathered from a statement that which have a limited, spring-resisted side play. The nor-mal wheel-base of each truck is 12 ft., the total wheel-base32 ft., and the length over all 36 ft. This machine should becapable of an almost unmatched speed and freedom in fol-lowing irre

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