. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . Truck Comi)lete with Siugle-Phase Motors and Contact Shoes. voltage is then stepped down to that required on the tnjUey, whichmay be 2,000, 8,.3()(), (^(lOO, or even 11,000 volts. While \ye cannotspeak yet of a standard voltage, 3300 seems to be finding consider-able favor. The voltaire for which the motors are wound is 200or 250, the General Electric motors using the former voltage, andthe the latter


. Electric railways; a treatise on the modern development of electric traction, including practical instruction in the latest approved methods of electric equipment and operation . Truck Comi)lete with Siugle-Phase Motors and Contact Shoes. voltage is then stepped down to that required on the tnjUey, whichmay be 2,000, 8,.3()(), (^(lOO, or even 11,000 volts. While \ye cannotspeak yet of a standard voltage, 3300 seems to be finding consider-able favor. The voltaire for which the motors are wound is 200or 250, the General Electric motors using the former voltage, andthe the latter. When o])erating on alternating cur-rent the motors are connected in parallel, and when running ondirect current they are connected in .series. ^Motors have beenconstructed from 50 to 225 horse])ower, and there is no why larger ones c(juld not be made to operate with Among the roads in this country which arc either , orplanning to usv single-]) current, may i)c mentioned the Ballston-Scheneetady line, which was one of the first . to be ecjuipped THE ELEClllIC RAILWAY 145. Magnetic Speed Indicator. and has hcen in successful operation for sonu- time. This roaduses the alternating-current motor developed by the General P^lec-tric Co. The motors are adapted for operation on the 2,000-v()ltalternating-current trolley between cities, and on the standard GOO- volt direct current in are wound for 400 volts, and areoperated in series on the (iOO-volt directcurrent. The frequency used is 25cycks. Current is supplied by anoverhead trolley, no feeders being second road of importance isone in Georgia between Atlanta andINIarietta, which is 15 miles in uses the Westinghouse ec[ current on the trolley is 2,200 voltsand 25 cycles. It is transmitted at avoltage of 22,000. Another road of importance is theIndiana! and Cincinnati interurbanline, 41 miles in length, which hasbeen


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