. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . is similar, except that the widthis increased by the standard spacing between double tracks andthe top is a compound curve made up of two 8-foot-radiuscurves at the sides which compound into a curve over the centerwhich will give a clear height of 22 feet 6 inches over the centerof each tie. The base of the roof curve is 13 feet 6 inches abovethe top of the ties. The bottom slopes to a central gutter whichis 6 inches
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools, and a hand-book for the use of engineers in field and office . is similar, except that the widthis increased by the standard spacing between double tracks andthe top is a compound curve made up of two 8-foot-radiuscurves at the sides which compound into a curve over the centerwhich will give a clear height of 22 feet 6 inches over the centerof each tie. The base of the roof curve is 13 feet 6 inches abovethe top of the ties. The bottom slopes to a central gutter whichis 6 inches below the side corners, which are at sub-grade. Six-inch cast-iron pipes should be spaced as needed and run fromeach side to the central gutter. The width of both single anddouble track tunnels should be increased, if the tunnel is on acurve, and the track centers should also be displaced, so thatthe clearance on each side is as great as on a tangent. , 90 and 91,* show some typical cross-sections. 199. Grade. A grade of at least is needed for the tunnel is at the summit of two grades, the tunnel grade ♦ DrinkersTunneling., §198. TUNNELS. 23.*^. Fig. 89.—IIoosac Tunnel. Section throxtgh Sqlid Roc|k.
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Keywords: ., bookauthorwebbwalt, bookcentury1900, bookdecade1920, bookyear1922
