. Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others .. . per contact wire, at mid-points between messenger hangers. 454 ELECTRIC TRACTION FOR RAILWAY TRAINS The steel does not expand or kink like copper. The tension in this steel wire doesnot exceed the elastic limit of the steel at low temperatures. The maintenance expense per mile of line and per passenger train-mile is reportedto be decidedly less for the catenary construction than for the third-rail constructionused by the Hew Haven for one-third of it
. Electric traction for railway trains; a book for students, electrical and mechanical engineers, superintendents of motive power and others .. . per contact wire, at mid-points between messenger hangers. 454 ELECTRIC TRACTION FOR RAILWAY TRAINS The steel does not expand or kink like copper. The tension in this steel wire doesnot exceed the elastic limit of the steel at low temperatures. The maintenance expense per mile of line and per passenger train-mile is reportedto be decidedly less for the catenary construction than for the third-rail constructionused by the Hew Haven for one-third of its run. Harlem River catenary construcxion, for 62 miles of freight yards, embodiestowers along each side of the tracks on about 250-foot centers, which towers arecross connected by 7/8-inch steel cable, which usually spans 6 to 9 tracks. Sus-penders are on 10-foot centers and support a porcelain- insulator, below which aresuspenders for a 2/0 steel contact line. Two additional cross catenary spans connectthe towers to steady the contact line. There is no catenary parallel to the contacthne. See drawings by Murray, A. I. E. E., April, Fig. 179.—New York, New Haven and Hartford Railroad Overhead Construction. New York, West Chester and Boston 4-track catenary construction embodiessteel bridges on 300-foot centers, 7/8-inch main messenger strand, from which 5/8-inch messenger strand is suspended at two points 50 feet from each tower. Hangersare placed on 10-foot centers and support a 4/0 copper wire and a 4/0 steel contactwire. The four messenger cables are cross-connected by 41-foot 3-inch, foot I-beams, at points 50 feet each side of each tower. Boston and Maine 4-track yard construction embodies two latticed steel towersat each side of the track, top connected by a 5/8-inch steel strand; a large sag;5/16-inch soft steel strand suspenders; and insulators in the suspenders, belowwhich is a 4/0 copper wire and a 4/0 contact wire. Between the insulator u,nd t
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Keywords: ., bookcentury1900, bookdecade1910, bookidelec, booksubjectrailroads
