. Railway maintenance engineering, with notes on construction . 5ize .ofCulvert Area of Ofening Concrete Reinforcing Rods Volume Weght Per Cu. vds. WingsPorta 5 Per BarrelLbs. ■9-ft. 16 /25 6 ft 25 200., 8ft. 68 750 /Oft 98 975 /oforlOSp ^~f Stone Paving on DownStream End only >\/6f-g for •^Span »t/i5|<;C S ..^/2&i n .. „ W „. Longitudinal Section. End Elevation. Fig. 37.—Reinforced Concrete Arch Culverts, Pennsylvania Railroad. To face page i BRIDGES, TRESTLES AND CULVERTS 61 h
. Railway maintenance engineering, with notes on construction . 5ize .ofCulvert Area of Ofening Concrete Reinforcing Rods Volume Weght Per Cu. vds. WingsPorta 5 Per BarrelLbs. ■9-ft. 16 /25 6 ft 25 200., 8ft. 68 750 /Oft 98 975 /oforlOSp ^~f Stone Paving on DownStream End only >\/6f-g for •^Span »t/i5|<;C S ..^/2&i n .. „ W „. Longitudinal Section. End Elevation. Fig. 37.—Reinforced Concrete Arch Culverts, Pennsylvania Railroad. To face page i BRIDGES, TRESTLES AND CULVERTS 61 however, is excessive, from including the crossing of Lake Pontchartrainnear New Orleans, on a trestle 22 miles long. Omitting this, we wouldget only 162 ft. per mile as a maximum. The use of these temporary structures was one of the charac-teristics of American railway construction at that period andenabled the large amount of new lines to be completed at a muchcheaper cost and more rapidly than would otherwise have been
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