. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . Fig. 87.—Hoosac Tunnel. Section through Solid Rock,. Fig, 88.—Hoosac Tunnel. Section through Soft Ground. 196 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 timnel unless thetunnel is very short The additional atmospheric resistance andthe decreased adhesion of the driver wheels on the damp rails ina tunnel will cause an engine t
. Railroad construction : theory and practice : a textbook for the use of students in colleges and technical schools . Fig. 87.—Hoosac Tunnel. Section through Solid Rock,. Fig, 88.—Hoosac Tunnel. Section through Soft Ground. 196 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 timnel unless thetunnel is very short The additional atmospheric resistance andthe decreased adhesion of the driver 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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