. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . f the Boston &Maine Railroad. Snow-fences, in connection with a moderateamount of shoveling and plowing, suffice to keep the tracksclear on railroads not troubled with avalanches. In such casessnow-sheds are the only alternative. 365. Snow-sheds. These are structures which will actuallykeep the tracks clear from snow regardless of its depth they are only necessary in the comparatively raresituations where the snowfall is excessive and where the snow 392 RAIL
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . f the Boston &Maine Railroad. Snow-fences, in connection with a moderateamount of shoveling and plowing, suffice to keep the tracksclear on railroads not troubled with avalanches. In such casessnow-sheds are the only alternative. 365. Snow-sheds. These are structures which will actuallykeep the tracks clear from snow regardless of its depth they are only necessary in the comparatively raresituations where the snowfall is excessive and where the snow 392 RAILROAD CONSTRUCTION. §365, is liable to slide down steep mountain slopes in avalanches frequently bring down with them rocks, trees,and earth, which would otherwise choke up the road-bed andrender it in a moment utterly impassable for weeks to sheds are usually built of 12 X12 timber framed in aboutthe same manner as trestle timbering; the ^bents are some-times placed as close as 5 feet, and even this has proved insuffi-cient to withstand the force of avalanches. The sheds are there-. Level-fall shed Fig. 1G2.—Snow-sheds—Oanadian Pacific Railroad. fore so designed that the avalanche will be defected over theminstead of spending its force against them. Although thesesheds are only used in especially exposed places, yet their lengthis frequently very great and they are liable to destruction by confine such a fire to a limited section, ^^fire-breaks aremade—, the shed is discontinued for a length of perhaps 100feet. Then, to protect that section of track, a V-shaped de-flector will be placed on the uphill side which will deflect alldescending material so that it passes over the sheds. Sohd crib § 366. MISCELLANEOUS STRUCTURES AND BUILDINGS. 393 work is largely used for these structures. Fortunately suitabletimber for such construction is usually plentiful and cheapwhere these structures are necessary. Sufficient ventilationis obtained by
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