. Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others .. . h Bend; ValtelHnaRailway of Italy. Installations on Railways. Tables: Direct-current, three-phase, single-phasr? Literature. 224 CHAPTER VI. MOTOR-CAR TRAINS. DEFINITION. A motor-car train is defined as a group of mechanically connectedcars equipped with and propelled by electric motors under some or allof the cars of the train. It is generally controlled by an operator,at the head of the train, on the multiple-unit plan of secondary control. THE DEV
. Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others .. . h Bend; ValtelHnaRailway of Italy. Installations on Railways. Tables: Direct-current, three-phase, single-phasr? Literature. 224 CHAPTER VI. MOTOR-CAR TRAINS. DEFINITION. A motor-car train is defined as a group of mechanically connectedcars equipped with and propelled by electric motors under some or allof the cars of the train. It is generally controlled by an operator,at the head of the train, on the multiple-unit plan of secondary control. THE DEVELOPMENT. The development shows that, since 1885, single-truck motor carsfrequently have hauled light trailers for heavy morning and eveningstreet-car service. Interurban and suburban traffic required a double-truck car. At first there was one 50-h. p. motor on each truck; butthe weight on the drivers was not sufficient, and the wheels slipped,causing a waste of power and also of time. Four-motor equipmentswere then adopted, about 1898-1900. The limit in the seating capacityof a suburban car was soon reached, because, when the car was over. Fig. 51.—Metropolitan Elevated Railway, Chicago, Motor-car Train. 55 feet long it could not be turned on a short radius curve at a streetintersection. Two-car trains, a motor and a coach, or two motor cars,operated by ofie motorman and one conductor for heavy traffic was aneconomic development which soon followed; but city councils generallyprohibited the use of an interurban 2-car train on city streets; and trains15 225 226 ELECTRIC TRACTION FOR RAILWAY TRAINS of 2, 3, and 4 cars were compelled to use a private right-of-way, withinthe city limits. Locomotive cars, loaded with passengers, hauled trains at Chicagofor the Columbian Exposition, in 1893, and for the Metropolitan WestSide Elevated Railroad in 1895. The plan was not satisfactory becausethe locomotives did not have the tractive effort which is required forrapid acceleration. The
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