. Concrete bridges and culverts, for both railroads and highways . 2 Portals:—Concrete 88 yds. (ft. $ $701 Bfirrel per lin. 8 yds. ^ $ = $().steel 1015 lbs. ftt ••^15 = l-»-- Length for 20 ft. bank = 30 \rea --- 250 s<i. ft. Cost t30!-U. Fig. 53. CONCRETE ClLIERTS AXD TRESTLES. 225 E span ]0 Back (if abntiiuMits hallci- one in iimiilirr of siiuarc inches of steel for oneedsfe pel lineal foot of arch is R L 400,000 D. L is the liv(^ load in pounils Hiat can l)e concen-trated on the half arch for one track.

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