. Railroad construction. Theory and practice . 14 feet wide, and even less, andalso up to 18 feet, especially when on curves. 24 to 26 feet isthe most common width for double track. Many double-tracktunnels are only 22 feet wide, and some are 28 feet wide. Theheights are generally 19 feet for single track and 20 to 22 feetfor double track. The variations from these figures are con-siderable. The lower limits depend on the cross-section of therolling stock, with an indefinite allowance for clearance and ven-tilation. Cross-sections which coincide too closely with what isabsolutely required for
. Railroad construction. Theory and practice . 14 feet wide, and even less, andalso up to 18 feet, especially when on curves. 24 to 26 feet isthe most common width for double track. Many double-tracktunnels are only 22 feet wide, and some are 28 feet wide. Theheights are generally 19 feet for single track and 20 to 22 feetfor double track. The variations from these figures are con-siderable. The lower limits depend on the cross-section of therolling stock, with an indefinite allowance for clearance and ven-tilation. Cross-sections which coincide too closely with what isabsolutely required for clearance are objectionable, because anyslight settlement of the lining which would otherwise be harm-less would then become troublesome and even dangerous. , 88, and 89 * shoAV some typical cross-sections. 165. Grade. A grade of at least 0 2% is needed for the tunnel is at the summit of two grades, the timnel gradeshould be practically level, Avith an alloAvance for drainage, the * Drinkers Tunneling. § 165. TUNNELS. 186. Fig. 87.—Hoosac Tunnel. Section through Solid Rock,
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