File:The Street railway journal (1903) (14574789077).jpg

Identifier: streetrailwayjo211903newy (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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onsimiption 38.GO watt-hours per ton kin. met r.s-j = 30 km. per lOUr i^r .seo.- \^ „,= 5 A rip. I—1 . ■lit :-l-7.5 -An .30-/ ^— Itfo m 1 i 1 20 30 40 50 (iOSeconils 70 SO 90 100 110 Street Ry.Journal CHARACTERISTIC CURVES OF BERLIN ELEVATED RAILWAY MOTOR tory. The objections to it, which are common, however, to allone-motor-car-two-motor-car systems, are that it requires a verylarge controller, there is no automatic throttling of the current,and no more than two motor cars can be used per train. Onthe other hand, the advantages are that only one train cable isrequired per train, and only one controller per motor car. Inthe system of the Berlin Elevated Railway two train cables areused, but one is simply to connect the shoes on the two motorcars, and the system could be arranged to operate without this ,connection, although it is desirable because of the possibility ofbridging over interruptions in the third rail and also for giving January 3, 1903.) STREET RAILWAY JOURNAL. 29
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30 STREET RAILWAY JOURNAL. (Vol. XXL No. i. double the contact surface by utilizing the shoes at both ends ofthe train. The diagrams on page 29 show the connections employed.As usually made up a train on the Berlin Elevated Railway con-sists of three cars, 39 ft. long. Of these, two, the first and thelast, are for third-class passengers and are motor cars. Theintermediate car is for second-class passengers and is a trailcar. There is no first-class car. Each motor car is equippedwith three motors, but the diagram is made out for the use offour motors, and the fourth motor can be added at any time. The controlling apparatus consists of two contact cylinders,one for the motor connections and the other for the resistances.The motor cylinder is made up of two halves, each of which issupplied with a separate set of contact fingers. The resistancecontroller cylinder has a sliding contact of the usual form forthrowing in the resistance. The motors on each car are always connected in multiple

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