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![Railroad structures and estimates . ement ofthe train through the tunnel is said to be the best ventilator.In long tunnels power-driven fans are sometimes used. The ordinary wood or rock tunnel Railroad structures and estimates . ement ofthe train through the tunnel is said to be the best ventilator.In long tunnels power-driven fans are sometimes used. The ordinary wood or rock tunnel](https://c8.alamy.com/comp/2CGY3PM/railroad-structures-and-estimates-ement-ofthe-train-through-the-tunnel-is-said-to-be-the-best-ventilatorin-long-tunnels-power-driven-fans-are-sometimes-used-the-ordinary-wood-or-rock-tunnel-sections-in-common-use-areshown-on-figs-41-and-42-and-their-average-cost-is-about-asfollows-fig-41-post-section-with-lagging-excavating-18-cubic-yards-per-lineal-foot-timber-450-feet-b-m-per-lineal-foot-cost-per-lineal-foot-45-to-55-without-track-or-ballast-post-section-without-lagging-excavating-18-cubic-yards-per-lineal-foot-timber-350-feet-b-m-per-lineal-foot-cost-per-lineal-foot-2CGY3PM.jpg)
Railroad structures and estimates . ement ofthe train through the tunnel is said to be the best ventilator.In long tunnels power-driven fans are sometimes used. The ordinary wood or rock tunnel
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