. Railroad structures and estimates . TOE CRIB mo 280 CONCRETE SNOW SHEDS. The crib and gallery- sheds (Figs. 97 and 98) are a combina-tion of crib and galleiy trestUng to take the slope with roof overtrack and timber trestle bents on the outside. Approximate cost, S30 to S60 per hneal foot of shed complete. Level fall shed not exposed to slides. The side walls are builtof round or square timbers sheathed ^-ith plank, with double-pitched roof over track, properly braced, with openings left forventilation. The width varies from 16 to 18 ft., and the height20 to 22 ft. 6 in. clear,
. Railroad structures and estimates . TOE CRIB mo 280 CONCRETE SNOW SHEDS. The crib and gallery- sheds (Figs. 97 and 98) are a combina-tion of crib and galleiy trestUng to take the slope with roof overtrack and timber trestle bents on the outside. Approximate cost, S30 to S60 per hneal foot of shed complete. Level fall shed not exposed to slides. The side walls are builtof round or square timbers sheathed ^-ith plank, with double-pitched roof over track, properly braced, with openings left forventilation. The width varies from 16 to 18 ft., and the height20 to 22 ft. 6 in. clear, the bents being spaced from 5 to 12 Approximate cost, SIO to S15 per lineal foot of shed complete. The Great Northern timber sheds are shown, Fig. 99. Thebents are 12 X 12 with plank braces, spaced 4 ft. center to \ Drift Bolt. OUTER PANEL INLEVEL GROUND X Drift Bolts• Crib where requiredon steep groimd Drift Bolted each BeArJTig SECTIONAL ELEVATION Fig. 99. Great Northern Snow Shed. center where hea\y slides are expected and 8 ft. center to centerfor hghter slides. On flat ground the timber crib is omitted onthe outer side of the shed and the roof is extended or canti-levered only halfway over the track. It was estimated that 6100 ft. of timber shed (100 ft. replac-ing old sheds) would cost 8450,000. Concrete and Wood Snow Sheds. — Combination snow shedsof concrete and wood on the line of the Great Northern Rail-way crossing the Cascade Mountains, in Washington, as illus-trated and described in Engineering News, Vol. 75, No. 25, isshown, Fig. 100.
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