, the girder is generally surmounted with a railing ; but when the roadway is between the main girders , no railing is required . If a footway is desired , it is carried on each side by cantilevers or prolongations of the cross girders , with the necessary railing for the protection of passengers .… … Fig . 706 . — Wrought - iron Trellis Bridge . Roadway at Bottom . plated parallel girders . The cost , however , is somewhat greater , owing to the plates requiring to be cut to waste , and the angle iron requiring setting and forging . In designing wrought - iron girder bridges for railway…
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