. The Street railway journal . ork used. There is a considerable amount of marine trafficin this river, which necessitated the installation of a draw-bridge—this was built for double-tracking to provide in ad-vance for the inevitable rapid development which suchthorough and excellent methods will produce. The drawbridge is mounted upon a center pier of greatstability, and is provided with an electrically-driven turningmechanism. The pier is of solid concrete, resting upon piles roofing, the result being as nearly fireproof as is possible. Current is received from the transmission lines at the
. The Street railway journal . ork used. There is a considerable amount of marine trafficin this river, which necessitated the installation of a draw-bridge—this was built for double-tracking to provide in ad-vance for the inevitable rapid development which suchthorough and excellent methods will produce. The drawbridge is mounted upon a center pier of greatstability, and is provided with an electrically-driven turningmechanism. The pier is of solid concrete, resting upon piles roofing, the result being as nearly fireproof as is possible. Current is received from the transmission lines at the sub-stations at 15,000 volts, three-phase alternating, being stepped-down in oil transformers to 380 volts before entrance to therotary converters. The rotaries deliver to the trolley lines at650 volts direct current. Each sub-station has two 300-kwrotaries, which are fed by three 200-kw step-down transform-ers. The switchboard equipment is very simple and conven-iently arranged for uninterrupted operation, consisting of one. OVERHEAD CROSSING OF THE LINE OF THE DETROITSOUTHERN RAILROAD NEAR TRENTON driven to a depth of 60 ft. below the bottom of the river. Theturning motor is of the railway type, taking current througha submarine cable, which also supplies the trolley wires uponthe bridge. The motor-controlling mechanism is convenientlyhoused and arranged for facilitating operation. The two-spanoverhead crossing illustrated involves the combined crossingof the three-track right of way of the Wabash Railroad and asingle-track branch of the Michigan Central Railroad. Theother plate-girder overhead crossing is over the main lineof the Detroit Southern Railroad, 2 miles south of Trenton. The standards of overhead constructionadopted for the extension also follow closelythose used upon the Toledo & Monroe poles are of cedar, in general being used, set 6 ft. into the cross arms, located near the top of thepole, carry the high-tension feeders, whileth
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
