. 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 . d it. General Remarks. The general practice in Europe is to allow only one train to bein a tunnel at one time. Many of the short works of this kindin France are built upon curves. The Hoffmuhl, 810 feet long,and the Bourg la Reine, 669 feet, are upon curves of about 2500feet radius. The Fesc, 547 feet, has a curve of 800 feet radius ;and the Vicrzon, 682 feet lung, is upon a reversed curve of 3280and 4100 fe
. 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 . d it. General Remarks. The general practice in Europe is to allow only one train to bein a tunnel at one time. Many of the short works of this kindin France are built upon curves. The Hoffmuhl, 810 feet long,and the Bourg la Reine, 669 feet, are upon curves of about 2500feet radius. The Fesc, 547 feet, has a curve of 800 feet radius ;and the Vicrzon, 682 feet lung, is upon a reversed curve of 3280and 4100 feet radii. These works, however, are all quite short. ROCKWORK AND TUNNELLING. 105 It may occur that a shaft can be driven into a heading horizon-tally, from a hill-side, at less expense than vertically, from of the small side-hill tunnels upon the French approach toMont Cenis had such shafts. The cars upon American roadsare now made so wide, and require so much space between thetracks, that the width of roadbed, originally ample, is at the pres-ent time only sufficient to allow the trains to pass safely. , which is a section of the Spruce Creek Tunnel, on the Penn-. Fig. 38. sylvania Railroad, shows how little room there is to spare whentwo trains occupy the tracks : the width in this case is 23 feet atthe widest part, the gauge 4 feet 9 inches, and the width betweentracks 6 feet. The Alleghany, or Gallitzin Tunnel, upon thesame road, has a width of 24 feet. The Hoosac Tunnel. The Hoosac Tunnel, now in process of construction beneaththe mountain of the same name in Western Massachusetts, is25,031 feet, or 4| miles in length. It is to be of the form and io6 MANUAL FOR RAILROAD ENGINEERS. dimensions shown in Figs. 39, 40, and 41, Fig. 39 representingthe section in the solid rock where a lining is not required. Theright hand half of Fig. 40 shows a half section of the tunnelarched ; the left hand half of the same figure shows a half sec-tion with the lining and wi
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherbosto, bookyear1883
