. Railroad structures and estimates . GALLERY 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
. Railroad structures and estimates . GALLERY 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
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