. Railroad structures and estimates . -105^ B. R. & P. RY. ENGINE W. M. RY. ENGINE 239. Typical Cross Sections of Engine Houses. COST OF ENGINE HOUSES. 501 In the niill type l)uilcling where laminated construction isused on tlie roof and heavy wood beams for the roof timbersand posts these defects do not occur; a liuiUUng of this sortis semi-fireproof, is very hard to burn, is fairly low in first cost,easy to maintain, and in the event of a change of location hassome salvage. A few typical cross sections of the various types of enginehouse are shown, Figs. 238 and 239, which
. Railroad structures and estimates . -105^ B. R. & P. RY. ENGINE W. M. RY. ENGINE 239. Typical Cross Sections of Engine Houses. COST OF ENGINE HOUSES. 501 In the niill type l)uilcling where laminated construction isused on tlie roof and heavy wood beams for the roof timbersand posts these defects do not occur; a liuiUUng of this sortis semi-fireproof, is very hard to burn, is fairly low in first cost,easy to maintain, and in the event of a change of location hassome salvage. A few typical cross sections of the various types of enginehouse are shown, Figs. 238 and 239, which give a fair idea oftheir general construction. For the mill type the posts vary from 10 X 10 to 12 X 12^\-ith 6 X 6 or 6 X S braces connecting the posts and the mainrun ]>eams. The main beams vary from 10 X 12 to 10 X 16depending upon the span. Roof beams 8 X 12 to 8 X 16varjing from 6 ft. to 8 ft. centers over which is built a solidtimber roof with l^oards laid on edge and nailed sidewise, and theroof covering, tar and gravel or composition; usually the fire,rear
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