. Railroad structures and estimates . $ 60 4560757590 $, 71212191927 $ 00 96 (K) 152 on 152 00216 00 * $ $ Excavating and re6lling extra. RAIL CONXRETE CULVERTS. 145 Rail Concrete Culverts. — For permanent structures wherethere is insufficient head-room for culvert pipes or concrete archculverts, rail concrete culverts are used. Figs. 43, 44, 45 and 40. The spans given are from 4 to 10 f

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. Railroad structures and estimates . $ 60 4560757590 $, 71212191927 $ 00 96 (K) 152 on 152 00216 00 * $ $ Excavating and re6lling extra. RAIL CONXRETE CULVERTS. 145 Rail Concrete Culverts. — For permanent structures wherethere is insufficient head-room for culvert pipes or concrete archculverts, rail concrete culverts are used. Figs. 43, 44, 45 and 40. The spans given are from 4 to 10 feet, the arrangement con-sisting of concrete retaining walls, sloped with the bank, withconcrete reinforced floor over, 10 to 12 inches thick, the rein-forcement being old rails embedded in the concrete at about 12-inch centers. The floor is paved with field stones, and the endsof walls rip-rapped when necessarj, or concrete is used for floorand end walls, either plain or reinforced. SINGLE RAIL CONCRETE CULVERTS — 1 _ T. -J - 3. ,?!S^ Ll^S^l^;^^!-. I i^t<2^0-^« tSmin. L r°^Sbc«i PfflBg If Mcamtj l»2^<- •f «^V 4 FT. CULVERT Fig. 43. B=1KA

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