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 115
he intended section,and run along, on a slight ascent, until it reaches the top, whena pit may be sunk to the level of the floor, and the heading maybe started again, and the ascent commenced anew. 9° MANUAL FOR RAILROAD ENGINEERS. Examples of Actual Tunnels. The size and proportions of tunnels may… … widest, and 24] feet high above the roadway. Nearly half of itpasses through the Bath oolite (limestone) and the other halfthrough clay. It is straight, and rises from one end to the otherupon a grade of 1 in 100, or 52.8 feet per mile. For about threefourths of a mile it has no lining ; the…
Railroad engineering
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