. Railroad structures and estimates . is^^^g-3 X 8 X U 0. Plank X 6 X UoSpiked to J f /Stringers with V* ^ ~~X3oat Spikes ift Bolt Fig. 35. Ballast Floor Trestle, 111. Cent. PILE AND TRESTLE BRIDGES. 131 013 ^ Kj C 3 -^ 13 CO u DC 0 Q ce rr q: 0 0 00 III II ce _j 1 < Li. C/1 III 0 Q 1- Q. < < ce . _i 1- ^ -I 07: < m u< 3 \J. PQ o3 Pk COCO do 132 PILE AND TRESTLE BRIDGES. ,5; S3I0H

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