International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 624
or the sill. Sub-sills of 12-in. by 12-in. timber, laidin trenches, form a good foundation. Before laying thesub-sills, the ground should be thoroughly rammed to en-sure against settlement. This construction is illustrated inFig. 618. 1776. Refuge Bays.—On all trestles of a length of200 feet or… … the additional lengthnecessary to include therefuge bays. A refugebay of approved pat-tern is shown in Fig.G19. On trestles of a length exceeding fig. 619. 1,000 feet, every fourth refuge bay should be large enoughto contain a hand car and section gang. While repairsare being made on a trestle,…
Railroad engineering
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