International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 647
en thevertical and the batter posts, and in the longitudinal bra-cing, shown in detail at A. It will be observed that only intrestles exceeding a height of 20 feet are the posts givendimensions so large as 12 in. X 12 in. in cross-section, andthen only in the vertical posts. On the other hand,… … Fig. m:i. in., and for spans of 10 feet three pieces, each 8 in. x 17 in.This places the excess of timber, if any, where it is most RAILROAD STRUCTURES. 1233 likely to be needed. Many trestles are weak in the stringers,especially those designed for light traffic. On account oftraffic interchange,…
Railroad engineering
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