. Railway maintenance engineering, with notes on construction . Side Elevation A. Modified Type of Pit 118.—Cattle Guards. (Am. Ry. B. & B. Assn.) only be determined by experiment, and for this purpose portable snowfence is recommended. Where local conditions permit, a permanent snow fence located onthe right-of-way line is most economical. Where permanent wooden fences are used, the boards should belaid close, where the right of way is 50 ft. or less from the center of thetrack; for greater distances, space should be provided between th^ ♦Manual, 1911, p. 211, 208 RAILWAY IMAIXTENA
. Railway maintenance engineering, with notes on construction . Side Elevation A. Modified Type of Pit 118.—Cattle Guards. (Am. Ry. B. & B. Assn.) only be determined by experiment, and for this purpose portable snowfence is recommended. Where local conditions permit, a permanent snow fence located onthe right-of-way line is most economical. Where permanent wooden fences are used, the boards should belaid close, where the right of way is 50 ft. or less from the center of thetrack; for greater distances, space should be provided between th^ ♦Manual, 1911, p. 211, 208 RAILWAY IMAIXTENANCE boards, and at 100 ft. distance, 50 per cent, of the fence should be openspace. The height of permanent board fence depends upon the probableamount of snow. The maximum height, however, should be 10
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