. The Street railway journal . ining walls than to land for slopes. The walls under 14 ft. have avertical face, and the higher ones a recessed face with curvesjoining it to the faces of the coping and the footing. Thewalls are built on an easement of 7 ft. granted by theowners of the abutting property. They are of 113 15 gravelconcrete made with giant Portland cement, and rest ongravel foundations about 33^ ft. below the roadbed. Verti-cal expansion joints with a V-shaped groove on the sur-face are left every 50 ft., tar paper being used to separatethe abutting sections. In the
. The Street railway journal . ining walls than to land for slopes. The walls under 14 ft. have avertical face, and the higher ones a recessed face with curvesjoining it to the faces of the coping and the footing. Thewalls are built on an easement of 7 ft. granted by theowners of the abutting property. They are of 113 15 gravelconcrete made with giant Portland cement, and rest ongravel foundations about 33^ ft. below the roadbed. Verti-cal expansion joints with a V-shaped groove on the sur-face are left every 50 ft., tar paper being used to separatethe abutting sections. In the interior of the walk are placedvitrified clay conduits for carrying wires. They are madeup of sections 18 ins. long connected by iron dowels, withthe joints wrapped with two laps of cloth 6 ins. wide, dippedin cement grout before being applied. Manholes for hand-ling the wires are built into the walls every 400 ft. The problem of draining the cut proved a difficult was desirable to avoid raising the streets to pass over. POWER SHOVEL AT WORK ON THE BRIGHTON BEACH LINE it, but to do this would have required a depression of theroadbed which would have made gravity drainage impos-sible. A compromise was, therefore, effected which, withthe use of very light drainage grades, allowed the run-ofifto be diverted to the citys sewerage system. Concretetroughs are built the full width of the right of way at in-tervals of about 600 ft. and connected with a drain whichruns the full length of the cut. This system is connectedwith the city system and is made through a 36-in. sewer May II, 1907.] STREET RAILWAY JOURNAL. 831 i^ miles long. The transverse troughs vary in width from18 in. to 24 in. They are covered with iron gratings andare spanned by yellow pine stringers, 10 ins. square, car-rying the rails. In addition to this system, rapid drainageis provided by ditches lined with granite blocks, with acovering of cement grout located between the outside tracksand the retaining walls.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
