Manual for railroad engineers and engineering students : containing the rules and tables needed for the location, construction, and equipment of railroads as built in the United States (1883)
Vose, George L. (George Leonard), 1831-1910 · Boston : Lee and Shepard · leaf 118
ORK AND TUNNELLING. 93 terial was chiefly blue marl. The size of the heading was 5x3feet, the bottom being level with the topof the invert. The Almondsbury Tunnel, near Bristol, upon the Bristol andSouth Wales Junction Railway, Fig. 33, is 1221 yards long, 18feet 6 inches wide at the widest part,… … The Sydenham Tunnel, on the London, Chatham, and DoverRailway, is 2100 yards long, and is made through the Londonclay. It had seven shafts, varying from 50 to 186 feet in depth,and 9 feet internal diameter. Two only of these shafts wereintended to be left open permanently. The clay in which…
Railroad engineering
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