. Railroad structures and estimates . 0 $ $ The Can. Nor. double track tunnel under Mount Royal, Montreal,Canada, is said to have cost, excluding track and ballast perfoot $ The Can. Pac. double track tunnel between Hector and Yield issaid to have cost, excluding track and ballast, per foot $ 74 TUNNEL VENTILATION AND FLOORS. Tunnel Ventilation. — An improved system of ventilatingsome of the tunnels on the mountainous regions in West Virginiabetween Clarksburg and Parkersburg consisting of revolving fanspropelled by steam power plants located ne
. Railroad structures and estimates . 0 $ $ The Can. Nor. double track tunnel under Mount Royal, Montreal,Canada, is said to have cost, excluding track and ballast perfoot $ The Can. Pac. double track tunnel between Hector and Yield issaid to have cost, excluding track and ballast, per foot $ 74 TUNNEL VENTILATION AND FLOORS. Tunnel Ventilation. — An improved system of ventilatingsome of the tunnels on the mountainous regions in West Virginiabetween Clarksburg and Parkersburg consisting of revolving fanspropelled by steam power plants located near the portals, whichdrives fresh air ahead of the trains and insures comfortable tem-peratures, cost $70,000 each. Tunnel Floors. — The A. R. E. A. recommended for doubletrack tunnels that the drainage should be provided for by theconstruction of a concrete channel midway between the tracks. Figs. 10 and 11 show the arrangement adopted in the River-mont tunnel (Southern Ry.) and the Richmond St. Tunnel,M. St. P. & S. Ste. Fig. 10. Rivermont Tunnel (Southern Ry.).
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