. The Canadian Pacific Railway . extensions of the typical sheds onthe flanks of tlie avalanche and outside its path, and where necessary areterminated by strong parapets as much as 10 feet high to prevent theoverflow of the lighter snow from the wings of the avalanche. By meansof these parapets 40 to 50 feet of shedding at each end is saved; and thesame principle is adopted where slides come down narrow ravines, inwhich case the profile of the roof is a trough the width of the are called scoop sheds. During the summer of 1886, fires denuded the mountain sides, leav-ing no support
. The Canadian Pacific Railway . extensions of the typical sheds onthe flanks of tlie avalanche and outside its path, and where necessary areterminated by strong parapets as much as 10 feet high to prevent theoverflow of the lighter snow from the wings of the avalanche. By meansof these parapets 40 to 50 feet of shedding at each end is saved; and thesame principle is adopted where slides come down narrow ravines, inwhich case the profile of the roof is a trough the width of the are called scoop sheds. During the summer of 1886, fires denuded the mountain sides, leav-ing no support for the snow on steep side hills, increasing the numberof slides and the demand for shed extensions. Sheds were lengthenedat each end and connected together until the longest shed exceeded 3 000feet. Long sheds are objectionable, not only on account of the greaterfire risk in summer, but in the handling of long freight trains on the PLATE II. TRANS. AM. SOC. CIV. ENCRS. VOL. XIX. No. 394. KEEFER ON THE CANADIAN PACIFIC THE CANADIAN PACIFIC RAILWASl. 69 heavy grades during the winter, when the sheds are entirely dark fromsnow fall and snow slides. The egress of smoke is then prevented, andbrakesmen are unable to see signals or hear whistles. In order to limitthe length of sheds, and maintain as many breathing holes as possible,a system of glance-wrorks was devised for the purpose of protecting thenecessary openings between sheds. These split fences, as they arecalled, are erected on the mountain slope above the track, and are con-structed of crib-work or piles, or both. They are triangular in plan,with the apex pointing upward, and on the center line of the snow the solid triangle which splits the slide, wings are slightly curvedand extended, until they pass the line of the shed portals, thus dividingthe slide and diverting its course right and left over the sheds. Wherethere is danger of the snow filling up and overflowing this split fence,a similar one i
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1888
