. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . FiQ. 89.—HoosAc Tunnel. Section through Solid Rock,. Fig. 90.—Hoosac TunneSc Section through Soft Ground. 234 RAILROAD CONSTRUCTION. 200. should be practically level, with an allowance for drainage, theactual summit being at either end but not in the center. Whenthe tunnel forms part of a long ascending grade, it is advisableto reduce the grade through the tunnel unless the tunnel isvery short. The additional atmospheric resistance and thedecreased adhesion of the driver wheels
. Railroad construction, theory and practice; a text-book for the use of students in colleges and technical schools . FiQ. 89.—HoosAc Tunnel. Section through Solid Rock,. Fig. 90.—Hoosac TunneSc Section through Soft Ground. 234 RAILROAD CONSTRUCTION. 200. should be practically level, with an allowance for drainage, theactual summit being at either end but not in the center. Whenthe tunnel forms part of a long ascending grade, it is advisableto reduce the grade through the tunnel unless the tunnel isvery short. The additional atmospheric resistance and thedecreased 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
Size: 1621px × 1541px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookidrailr, bookpublisheretcetc
