. Electric railway journal . e splicesare made by butt-welding and it is possible thatthe unfavorable experience of the Atlanta linemen re-sulted from these welding points being cooled toorapidly and thereby hardened. The manufacturingprocess is such that each splice is supposed to be thor-oughly annealed to prevent brittleness at the splices. Practices Designed to Reduce MaintenanceAND Car Delays The practice of backboning curves is not a new onebut it has probably been carried further on the At-lanta property than in nearly any other city. For allcurves in the entire system have been rebuilt
. Electric railway journal . e splicesare made by butt-welding and it is possible thatthe unfavorable experience of the Atlanta linemen re-sulted from these welding points being cooled toorapidly and thereby hardened. The manufacturingprocess is such that each splice is supposed to be thor-oughly annealed to prevent brittleness at the splices. Practices Designed to Reduce MaintenanceAND Car Delays The practice of backboning curves is not a new onebut it has probably been carried further on the At-lanta property than in nearly any other city. For allcurves in the entire system have been rebuilt in themanner illustrated in accompanying photographs. Theresult has been that the delay of a car on account of abreak at a curve is practically unknown, for with thepresent construction if a break does occur, only avery short piece of the wire hangs down and the carcan coast by the break without being delayed. Becauseof this assurance of not tying up the cars even if abreak does occur, it is possible with the back-bone con-. EACKBONB REINFORCEMENT OF TROLLEY CURVE ATBUSY DOWNTOWN CORNER WHERE ABSENCE OFANCHOR POLES BROUGHT BULL-RING CON-STRUCTION INTO USE If it is attempted to ham- struction to leave the trolley up until it is completelyworn out. In other words, early replacement of thewire does not have to be made as an insurance againstbreakage. The messenger cable forming the backbone is put upto parallel the trolley all the way around the curve. Ifit is a double-track curve,, both trolleys are the backbone is not made in one continuous wirtbut is turned back and served up at each pull-off, sothere is a short piece between adjacent guy wires. Thebackbone is separated from the trolley only by thehanger arm and wood strain insulator. At each endof the backbone, the guy wire is made to pull off asnearly tangent to the curve as is possible, consideringthe possible locations of a pole or other anchor. Withthis backbone construction the pull-off guys are so ar-range
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
