The Street railway journal (1905) (14781338713)

Identifier: streetrailwayj261905newy (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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on-kilometers. The virtual ton-kilometersare obtained by multiplying the weight of the train in tons withthe virtual length of the line—i. e., the length which a hori-zontal imaginary line would have, the energy consumption ofwhich is the same as that of the actual line with existinggrades. The number of virtual ton-kilometers on the Valtel-lina line during the above period was 92,541,511 ton-kilometers,or 57,514,923 virtual ton-miles, and therefore the average wattconsumption was 36.77 watt-hours per virtual ton-kilometer,or 59.16 watt-hours per virtual ton-mile. Several series of tests were made on the Valtellina line inorder to ascertain the watt consumption of trains measured onthe trolley wires—i. e., without the above-mentioned losses.One of the most complete tests was made April 20, 1904, witha train of 116 tons total weight, with a motor car at the head,on the Lecco-Colico line. This test was made during the nightwhen there were no other trains on the line, all transformer
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FIG. 22.—CONTROLLER FOR METAL RHEOSTA1 stations excepting one having been disconnected, so that thewattmeters in the central station were able to indicate the wattconsumption of the train, with the deduction of easily cal-culable losses in the one transformer and in the line. A total run was made from Lecco to Bellano, and vice versa.I hi average watt consumption of the train measured on thetrolley line was 30.2 watt-hours per ton-kilometer. I he number ol trains simultaneously on the Hue is very lim-ited, and normally there are not more than five to six duringthe busiest hour of the service. In the morning and in theevening there are even less. It is not to be wondered there-fore that the maximum load peak in the central station is aboutthree times as much as the average load for the whole day. JOURNAL. 201 TIM-: ELECTRIC SERVICE ON THE VALTELLINA LINEDuring the last periods of steam traction the daily number oftrain-kilometers on the whole system were 1104, or 686 train-miles: wit