. The Street railway journal . there are five tiers of boards. TRACK The track is laid out as carefully as though the road was tobe operated by steam locomotives. Cross-ties number at least2816 to the mile. The service rails are 70-lb. A. S. C. E. sec-tion, in 30-ft. lengths. The gage is 4 ft. 8j4 ins. on straightlines. The spreading of gage on curves is shown in Table II: TABLE II. Add to gage Add to gage Degree of of track Degree of of track Curve Inches Curve Inches 2 Vs 8 4 % 10 % 6 %This increase of gage is accompanied by the superelevationof the outer rail shown in Table III: TABLE III.
. The Street railway journal . there are five tiers of boards. TRACK The track is laid out as carefully as though the road was tobe operated by steam locomotives. Cross-ties number at least2816 to the mile. The service rails are 70-lb. A. S. C. E. sec-tion, in 30-ft. lengths. The gage is 4 ft. 8j4 ins. on straightlines. The spreading of gage on curves is shown in Table II: TABLE II. Add to gage Add to gage Degree of of track Degree of of track Curve Inches Curve Inches 2 Vs 8 4 % 10 % 6 %This increase of gage is accompanied by the superelevationof the outer rail shown in Table III: TABLE III. Degree of Superelevation Degree of Superelevation Curve Inches Curve Inches deg. min. deg. min. 0 30 % 4 3% 1 1116 4 30 3% 1 30 1 3-16 6 4 2 1% 6 4 13-16 2 30 2 7 B% 3 2 716 8 6 7-16 3 30 2 13-16 648 STREET RAILWAY JOURNAL. [Vol. XXL No. 18. The superelevation tapers out in 5 ft. per degree of are 7 ft. 6 ins. long;, 8 ins. wide and 6 ins. thick, their;ateria] being Washington fir. There are four spikes to each. TRESTLE CONSTRUCTION tie, two inside and two outside the rail, staggered to avoidsplitting the tie, and the two inside spikes are driven in thesame edge of tie so as to keep the ties at right angles to the track. Spikes were driven not over 4 ins. from center to centeron a line parallel with the rail. The rails were laid to breakjoints, not more than i ft. variation, centering joint at the side of the rails, the ends and edges of the plank nearest the railbeing bevelled. Weber joints are used. THIKD RAIL The third or contact rail weighs 100 lbs. per yaid, and islocated with its central vertical axis 21 7-32 ins. from the gageline of the service rail and at the outside of the track. It islaid in 30-ft. length, and is supported by reconstructed graniteinsulators, furnished by the General Electric Company. Thetop of the insulator brings the rail base 6 ins. above the ties,and the insulators weigh about 25 lbs., and are fitted with a Degi .esFahrenheit807060
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
