. The railroad and engineering journal . fig. .Vs be pumped to the surface. At the level of the tunnel alarge opening is made which will serve for the intention is to use only a single track, it is thoughtthat the passage of trains from either direction will serveto clear the tunnel of smoke and gas, and it is also pro-posed to try a car of peculiar construction, having a circu-lar front nearly filling the entire diameter, for this purposealso. If necessary, however, a system of artificial ventila-tion can be adopted. As shown in figs. I, 2 and 3, the tunnel lining w


. The railroad and engineering journal . fig. .Vs be pumped to the surface. At the level of the tunnel alarge opening is made which will serve for the intention is to use only a single track, it is thoughtthat the passage of trains from either direction will serveto clear the tunnel of smoke and gas, and it is also pro-posed to try a car of peculiar construction, having a circu-lar front nearly filling the entire diameter, for this purposealso. If necessary, however, a system of artificial ventila-tion can be adopted. As shown in figs. I, 2 and 3, the tunnel lining will becomposed of cast-iron rings m. ( ft.) in length,each ring being composed in its turn of 12 cast-iron plates,all of the same dimensions, and one smaller, or key-plate,placed at the top of the ring. The segments and the ringsthemselves will be joined together by bolts, as shown infig. 3, with proper packing for the joints. At regular dis-tances niches will be placed in which the men employed inthe tunnel can stand during the passage


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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887