. Railroad construction. Theory and practice . Fig. 87.—Hoosac Tunnel. Section through Solid Rock,. Fig. 88.—Hoosac Tunnel. Section through Soft Ground. 186 RAILROAD CONSTRUCTION. §166. actual summit being perhaps in the center so as to drain bothways. When the tunnel forms part of a long ascending grade,it is advisable to reduce the grade through the tunnel unless thetunnel is a ery short The additional atmospheric resistance andthe decreased adhesion of the dri^er wheels on the damp rails ina tunnel will cause an engine to work very hard and still morerapidly vitiate the atmosphere until the
. Railroad construction. Theory and practice . Fig. 87.—Hoosac Tunnel. Section through Solid Rock,. Fig. 88.—Hoosac Tunnel. Section through Soft Ground. 186 RAILROAD CONSTRUCTION. §166. actual summit being perhaps in the center so as to drain bothways. When the tunnel forms part of a long ascending grade,it is advisable to reduce the grade through the tunnel unless thetunnel is a ery short The additional atmospheric resistance andthe decreased adhesion of the dri^er wheels on the damp rails ina tunnel will cause an engine to work very hard and still morerapidly vitiate the atmosphere until the accumulation of poison-ous gases becomes a source of actual danger to the engineer and
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