The canadian magazine of politics, science, art and literature, November 1910-April 1911 . ueous orriver tunnel. The tunnel within has a clearanceof eighteen feet from the rails tothe top of the arch, and a width acrossthe centre line of sixteen and a halffeet. The sides are built up per-pendicularly for about five feet fromthe ties, to fonn benches to accommo-date the trackmen, and afford an exitfrom the tunnel above the benches are two and a half feetwide and are reached from the tracksby ladders built in the concrete wallat intervals of twenty-five feet, andmade flush with the su
The canadian magazine of politics, science, art and literature, November 1910-April 1911 . ueous orriver tunnel. The tunnel within has a clearanceof eighteen feet from the rails tothe top of the arch, and a width acrossthe centre line of sixteen and a halffeet. The sides are built up per-pendicularly for about five feet fromthe ties, to fonn benches to accommo-date the trackmen, and afford an exitfrom the tunnel above the benches are two and a half feetwide and are reached from the tracksby ladders built in the concrete wallat intervals of twenty-five feet, andmade flush with the surface. Theopen drain between the rails takes offthe water frorn seepage, and that usedto wash down the sides keeps the in-terior in a state of glistening white-ness, and discharges it into a sump,or concrete well, at the bottom of theslopes, from which it is pumped outto the surface. Other sumps at eachend of the subaqueous section and atthe portals, receive the drainage fromthose portions of the tunnel. Thesesumps are of s\ifficient capacity to re-lieve the tunnel of the maximum rain-. LARGE LOCOMOTIVE CRANE, WITH LONG ARM, USED IN CONSTRUCTION WORK fall of this region, and are pumpedout at intervals by pumps actuatedby electric motors. Near the Detroit side the westernslope runs off on a level stretch ofabout 1,000 feet, or the length offour sections of the tubes, whereuponthe eastern slope begins. The east-bound traffic is much heavier than thewestbound, the former taking a one-and-a-half per cent, grade, while thelatter traffic, comprising many emptycars, takes a two per cent, grade. Thetwo curves in the tunnel are 2,600feet long, with a maximum curvatureof two degrees. Perfect ventilationin the tubes is provided for by thetwin-tube shafts at either end of thesubaqueous section. The trains run-ning through each tube in one direc-tion create strong currents of airwhich are drawn in through the shaftsand forced out at the portals. The 56 tubes are well lighted by glow lampspl
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcanadia, bookyear1893
