. The Street railway journal . feetten inches deep, a still deeper excavation was pulley vaults are spaced thirty-five feet apart, with amanhole between the tracks where the tracks run neartogether, but where the tracks are spread to a consider-able distance, manholes are provided for each track. Thepulley vaults are drained by eight inch pipes, and aretrapped where connections are made with the sewer. Onsome parts of the line both tracks were constructed at thesame time, all the dirt from the excavation being cartedinto the side streets. In some sections it was necessary toblast
. The Street railway journal . feetten inches deep, a still deeper excavation was pulley vaults are spaced thirty-five feet apart, with amanhole between the tracks where the tracks run neartogether, but where the tracks are spread to a consider-able distance, manholes are provided for each track. Thepulley vaults are drained by eight inch pipes, and aretrapped where connections are made with the sewer. Onsome parts of the line both tracks were constructed at thesame time, all the dirt from the excavation being cartedinto the side streets. In some sections it was necessary toblast a channel through solid rock. Besides the crossmains of gas and water pipes frequently met with, therewere encountered at the curve on the Bowery, near 5thStreet, a nest of five large gas and water mains, whichcrossed the line diagonally and continued parallel to itfor several hundred feet. These all had to be lowered,the gas mains renewed and the water mains placed in abrick subway with I beam support, and of sufficient size. FIG. 4.—125TH STREET CABLE CROSSING/ to allow of access to the mains for the entire this point, on the Bowery, a large number of sewermanholes, which are about 125 ft. apart, and which camedirectly in the line of the west track, had to be work consists in removing the brickwork of the oldshaft down to the line of the sewer, a distance of abouttwelve feet, and building arched transverse chambers ofbrick of sufficient length to bring the manhole outside ofthe tracks, and then rebuilding the shaft, it being necessary 44 THE STREET RAILWAY JOURNAL. [Vol. X. No. i to shore up the sides of the excavation as the forma-tion for most of the way was sand. The terminal andinterior vaults are five in number, and each requiredspecial construction. The vault for the northern terminalat 130th Street, is sunk below the level of high waterin the Harlem River, and is divided by a large sewerwhich had to be preserved intact. The pulley vault i
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Keywords: ., bookcentury1800, bookdecade1880, bookidstreetrailwa, bookyear1884
