File:The street railway review (1891) (14781498053).jpg

Identifier: streetrailwayrev14amer (find matches)
Title: The street railway review
Year: 1891 (1890s)
Authors: American Street Railway Association Street Railway Accountants' Association of America American Railway, Mechanical, and Electrical Association
Subjects: Street-railroads
Publisher: Chicago : Street Railway Review Pub. Co
Contributing Library: Carnegie Library of Pittsburgh
Digitizing Sponsor: Lyrasis Members and Sloan Foundation

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re is an inductive drop in the trolley and rails with anadditional loss in the latter due to eddy currents and hysteresis.Measurements made niinn the Ballston line indicate an apparenttrolley resistance of i.,^ times the ohmic resistance and a rail resist-ance of 6.55 times the ohmic resistance. The resistance of the alter-nating current trolley wire is somewhat reduced by the steel catenaryin parallel with it. This increased resistance w-ith alternating cur-rent would be a serious factor in low voltage city systeius, butsince the compensated motor operates efficiently on direct currentcity systems no necessity exists for a low voltage alternating trolleyline. The form of overhead construction adopted for the Ballston lineis well adapted to the requirements of steam roads where the localservice is operated electrically and through passenger and freightservice handled by steam locomotives. The trolley wire and insul-ators being off center are not exposed to the .gases of the locomotive
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controller. One of the most valuable features of this system and onewhich, we believe, will appeal strongly to railway managers, is thefact that the motors and systetn of control are designed to operatewith equal facility upon both alternating currents and upon theordinary 600-volt direct current. This arrangement makes it pos-sible (o operate cars over existing city tracks without in any waysacrificing their running (pialities upon the intcrurbau sectionsequipped with alternating current. The Ballston extension of theSchenectady Ky. is 15^ miles long including .l.y miles in the cityof Schenectady, the latter being equipped for direct current. Theinlcrurban section is double track on private right of way, laid with7S-lb. T-rails and has a maximinn grade of i.H per cent. The sharp-est cur\e is 4!4°. Center prjie and bracket construction is used forftupporting Ihc direct current trolley wires and a cross arm supportsthe 2,200-volt altern

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