. The Street railway journal . re, and the pro- ,Sposed electrification of the cable lines in San Francisco have gcalled renewed attention to the methods of controlling thespeeds of electric cars on grades by counterweights, such ashave been installed in San Francisco, Portland, Providence,and Sydney, N. S. W. The first three have been described sin this paper, and an account of that at Sydney, by PercyWilliam Shaw, M. Inst. C. E., is given in a paper recentlypresented before the Institution of Civil Engineers, of Lon-don, and just published in the printed proceedings of that gbody. This line
. The Street railway journal . re, and the pro- ,Sposed electrification of the cable lines in San Francisco have gcalled renewed attention to the methods of controlling thespeeds of electric cars on grades by counterweights, such ashave been installed in San Francisco, Portland, Providence,and Sydney, N. S. W. The first three have been described sin this paper, and an account of that at Sydney, by PercyWilliam Shaw, M. Inst. C. E., is given in a paper recentlypresented before the Institution of Civil Engineers, of Lon-don, and just published in the printed proceedings of that gbody. This line was completed and opened for traffic in uNovember, 1903, and was constructed under the direction of «H. Deane, chief engineer for railway construction, with Mr. 0Shaw as supervising engineer for tramway construction and =Thomas Rhodes, assistant engineer. The line is an extension of the Balmain Tramway, at Syd-ney, to the Darling Street wharf, and has a grade of gl/2 percent for 200 ft., and per cent for 440 ft. Although. FIG. 2.—CROSS SECTION OF SHEAVE PIT electric cars are frequently run on steeper grades with ad-hesion only, it was not considered by the railway commis-sioners, who control the tramways in New South Wales,advisable to build lines on grades steeper than per cent,or 1 in 12. The cars on this line run on a 20-minute head-way. As shown in the plan in Fig. 1 and in the two sections, theconduit for the balance weight is laid at the side of the trol-ley track and is covered with ferro-concrete plates. Thegrade is uniform at per cent, or 1 in The railsweigh 60 lbs. per yard and are mounted on stringers 10 ins. x5 ins. x 15 ft. in length, which are imbedded in concrete andheld down by iron dowels. The carrier sheaves for the cableare 12 ins. in diameter and spaced 30 ft. apart. The gage ofthe rails is 2 ft. 6 ins. The service track is laid with 83-lb. rails on a concrete sub-base 6 ins. in thickness. The rails are anchored down bymeans of two sho
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
