. The Street railway journal . A TYPICAL STEEL BRIDGE WITH REINFORCED CONCRETEFLOOR ARCHES CU. yds., and this practically was balanced by the materialneeded for the fills. The result of this work has been tolimit the maximum grade to 2^ per cent, and the maxi-mum curve, except at the Strafford loop, to 5 degs. The5-deg. curve is practically no hindrance to the service, sinceit is very near the Bryn Mawr station, where trains mustslow down as a matter of course. TRACK AND THIRD-RAIL CONSTRUCTIONAs already noted, the service tracks at present are double,but there are extra loading tracks and pla
. The Street railway journal . A TYPICAL STEEL BRIDGE WITH REINFORCED CONCRETEFLOOR ARCHES CU. yds., and this practically was balanced by the materialneeded for the fills. The result of this work has been tolimit the maximum grade to 2^ per cent, and the maxi-mum curve, except at the Strafford loop, to 5 degs. The5-deg. curve is practically no hindrance to the service, sinceit is very near the Bryn Mawr station, where trains mustslow down as a matter of course. TRACK AND THIRD-RAIL CONSTRUCTIONAs already noted, the service tracks at present are double,but there are extra loading tracks and platforms at the. LOOKING WEST AT THE GREAT ROCK CUT NEAR THEPOWER HOUSE, WITH SIGNAL POST AT THE RIGHT terminals, the Bryn Mawr station and other places wherepicnics or college games involve the handling of large num-bers of people in short periods. At Strafford, for example,there is an extra track to allow room for eight to ten the entire system the track consists of laid on wood ties spaced 21^ ins. center to centerin rock ballast taken from the companys quarries along I054 STREET RAILWAY JOURNAL. I Vol. XXIX. No. 24. the line. The rails have Continuous joints and are bondedwith two 400,000 circ. mil Protected bonds per joint. The striking feature of the power-collection system is theuse of the Farnham inverted U-shape third rail. This con-ductor is of soft steel, its low proportion of carbon givingit a conductivity equal to an 800,000 circ. mil copper ca-ble, while its bearing surface is equivalent to a 70-lb. U-shape of the rail offers another advantage in
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
