. Railroad structures and estimates . form Canopies. — The inverted type of stationcanopies shown in Figs. 160 and 161 illustrates the designs onthe N. Y. C. The roof is supported by one row of posts downthe center of the platform and drains to the center, the waterbeing carried off by downspouts inside the posts. Fig. 161 is for platforms used exclusively for passenger busi-ness and Fig. 160 is for platforms used both for freight andpassenger. In the former case the butterfly extension coversthe platform to a greater extent than the latter, as is shown bythe clearances. The posts are made of
. Railroad structures and estimates . form Canopies. — The inverted type of stationcanopies shown in Figs. 160 and 161 illustrates the designs onthe N. Y. C. The roof is supported by one row of posts downthe center of the platform and drains to the center, the waterbeing carried off by downspouts inside the posts. Fig. 161 is for platforms used exclusively for passenger busi-ness and Fig. 160 is for platforms used both for freight andpassenger. In the former case the butterfly extension coversthe platform to a greater extent than the latter, as is shown bythe clearances. The posts are made of four light angles or twochannels, placed back to back, with steel brackets and purlins,the roof boards being nailed to nailing strips secured to the topsof the beams and covered with composition roofing. The cost of this type of platform roof may be estimated at$ per square foot, which includes the ordinary foundationfor the posts 5 ft. below ground, but does not include any plat-form or drainage below and beyond the Fig. 160. N. Y. C. Butterfly Platform Shed, Passenger and Freight Traffic. -M
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