. Electric railway journal . onger to carry the third-rail insulator. The railsare fastened to the ties with j4-in. x 5^-in. screw joints are used, and the ties are spaced about23 in. apart, or 17 to a 33-ft. rail length. The third rail isalso an 85-lb. section. The lower portion of the track draw-ing shows the construction used on the sharper a guard rail is used, the section being PennsylvaniaSteel Companys No. 96. Filler blocks are installed be-tween the guard rail and the running rail, and the guardrail is supported by rail braces. All cables are run in vitri-
. Electric railway journal . onger to carry the third-rail insulator. The railsare fastened to the ties with j4-in. x 5^-in. screw joints are used, and the ties are spaced about23 in. apart, or 17 to a 33-ft. rail length. The third rail isalso an 85-lb. section. The lower portion of the track draw-ing shows the construction used on the sharper a guard rail is used, the section being PennsylvaniaSteel Companys No. 96. Filler blocks are installed be-tween the guard rail and the running rail, and the guardrail is supported by rail braces. All cables are run in vitri-fied clay, concrete-incased conduits which form a narrowwalk on each side of the tunnel. Safety niches are builtin the walls at short intervals. The drainage of the tunnel is cared for by three pumpingstations located, respectively, at Beach, Elm and UnionStreets. In each of these chambers two pumps are installed,one with a capacity of 100 gal. per minute and the otherwith a capacity of 1000 gal. per minute. The smaller pump. Washington Street Subway—Automatic Block Signal andAccessory Apparatus Mounted on Wall of Tunnel in each chamber is direct-driven by a 3-hp, 550-volt, direct-current motor, and the larger pump by a 20-hp motor. Allpumps are of the centrifugal type, located in the bottom ofa well in each case. The smaller pumps are designed tohandle the leakage and drainage of the tunnel under normalconditions, while the larger units start up automatically incase of an excessive flow of water, such as would be occa-
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
