. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ons it would be hard to finda better one in the city. Cathcart within 200 ft. of St. Catherine St.,the principal retail thoroughfare in the be provided with another outlet. .Abso-lute graile separation will thus be pro-vided for some 5 miles with no gradeexceeding per cent, of iZ ft. per mile,a result almost unique in urban railwayconstruction. As might lie expected the materialthrough which the tunnel is driven isnearly all rock. Near the western por-tal for some 20f) yds., surface
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ons it would be hard to finda better one in the city. Cathcart within 200 ft. of St. Catherine St.,the principal retail thoroughfare in the be provided with another outlet. .Abso-lute graile separation will thus be pro-vided for some 5 miles with no gradeexceeding per cent, of iZ ft. per mile,a result almost unique in urban railwayconstruction. As might lie expected the materialthrough which the tunnel is driven isnearly all rock. Near the western por-tal for some 20f) yds., surface clays andgravels predominate. Then comes theTrenton limestone lying in almost hori-zontal and undisturbed Iteds nearly tothe base of the steeper slope of theMain mountain mass. Next occur somecrystalline rocks and under the moun-t?in itself there is igneous rock knownto the geologists as essexile. On theeast side the limestone is again metwith, and some exca%ation in it is neces-sary to the very end, but the roof isin a very soft plastic clay for a distanceo nearly half a mile and \h\< portion. FORM OF DOUBLE AND SINGLE TUNNEL ON THE C.\\N NORTHERN AT , CANADA. direct access to the city than any otherroute, but it would give easy grades,avoid property damages, eliminate gradecrossings and permit of high speeds tothe citys very centre. Last, but by nomeans least, the Canadian Northern com-pletely solved the problem of the furtherexpansion of the city. It was a civicimprovement scheme as well as a rail-way project and it promised to net tothe owners of the trans-montaine prop-erty many times the cost of the was the history of the conceptionand the raison detre of the MountPoyal Tunnel. In detail the tunnel enters the groundv/here it crosses the C. P. R. belt lineand descends on a grade of per a point one mile east of the portalit is 250 ft. below the surface and a shaftv/as sunk at this point partly with theidea of making more rapid progr
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
