. Railroad structures and estimates . live load (eoopers E 50). Impact and vind as per Weight of Steelwork in Pounds = CD ■ — S X in Cubic Yards = CD i WrTH 40 FT. i aO FT. SPANS : = .1^ ~ Weight of Steelwork in Pounds = CD X ia50 -h S X in Cubic Yards = CD X 1 -r 350 Number of Piles = .5 X CD -i- 100 Floor length = AB Dead Load, — The dead load shall consist of the estimated weight of theentire suspended structure. Timber shall be assumed to wei^ 4| lb. perfoot B. M., ballast 100 lb. per cu. foot, and rails and fastenings 150 lb. perlineal ft
. Railroad structures and estimates . live load (eoopers E 50). Impact and vind as per Weight of Steelwork in Pounds = CD ■ — S X in Cubic Yards = CD i WrTH 40 FT. i aO FT. SPANS : = .1^ ~ Weight of Steelwork in Pounds = CD X ia50 -h S X in Cubic Yards = CD X 1 -r 350 Number of Piles = .5 X CD -i- 100 Floor length = AB Dead Load, — The dead load shall consist of the estimated weight of theentire suspended structure. Timber shall be assumed to wei^ 4| lb. perfoot B. M., ballast 100 lb. per cu. foot, and rails and fastenings 150 lb. perlineal ft. of track. ESTIMATING QUANTITIES, WOODEN TRESTLES. 31 TABLE 21. —WOODEN TRESTLES. 15 feet C. to C. of bents. Formula for Estimating Quantities. Live load (coppers E 50). WOODEN TRESTLES15 FEET C. TO C. BENTS^Base of Rail
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