. Railroad structures and estimates . PPROXIMATE ESTIMATE OF COST PER LINEAL FOOT. Items. Excavation BackfiU, Piles (wood) Drainage Concrete (plain) Concrete (reinforced).Steel Supervision Total cost per lineal foot of viaduct. :;ection A (22 ft. 6 in. high),reinforced wall. 6 cu. cu. lin. lin. cu. yds. 5 cu. lbs. 6 sq. cu. (about) $ $ $ Section B (22 ft. 6 in. high),semi-gravity wall. 6 cu. yds. $ 3 c
. Railroad structures and estimates . PPROXIMATE ESTIMATE OF COST PER LINEAL FOOT. Items. Excavation BackfiU, Piles (wood) Drainage Concrete (plain) Concrete (reinforced).Steel Supervision Total cost per lineal foot of viaduct. :;ection A (22 ft. 6 in. high),reinforced wall. 6 cu. cu. lin. lin. cu. yds. 5 cu. lbs. 6 sq. cu. (about) $ $ $ Section B (22 ft. 6 in. high),semi-gravity wall. 6 cu. yds. $ 3 cu. yds. 60 lin. ft. Per lin. ft. cu. yds. Nil. Nil. 500 lbs. 6 sq. yds. 38 cu. yds. 10% (about) $ Nil. $ Ties, ballast, rail and fastenings, or hand rail, common to all schemes are not included. (169) 170 COST OF VL\DUCT —FILL AND RETAINING W.\LLS. CELLULAR RETAINING WALL, MILWAUKEE TRACK TRACK VIADUCT, RETAINING WALLS AND tr ,Tie Wall Strut! 1 PLAN IL Typical Cellular Construction. T\BLE So. - APPROXBL\TE ESTL\L\fE OF COST, TWO TRACK VIADUCTWITH RETAINING WALLS AND FILL. Items. Excavation Back fill Drainage Concrete, Supervision Total cost per lineal foot of viaduct. Quantities. Section (14 in. high),two tracks. 4 cu. yds. 2 cu. lin. foot4? cu. yds. 3 sq. cu. (about) $ ( $. Ties, ballast, rail and fastenings common to any scheme not included in above estimate. WOOD TIES. 171 CHAPTER Wood Ties (Untreated). — The ties supporting the rails forordinary track work are usually of wood, although steel tieshave been used to some extent and experimental ties of concreteand steel and other combinations are being tried out. The ordinary wood track tie in general use varies from 6 to7 in thickness, 6 to 12 in width and 8 0 to 9 0 in length,and are either
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