. The street railway review . used in the Blackwell tunnel and the London and Glas-gow cable and electric railway tunnels, was contemplated, but theadvance in the cost of iron led the engineers to consider concrete,and this material will be used to such extent as the conditions de-veloped «n building shall warrant. Section A of the tunnel is in Maverick .Sq. and Lewis St., EastBoston. The structure is for two electric railway tracks and con-sists of 139 ft. of open incline and 680 ft. of wide arch subway. Theside walls of the incline are of concrete laced with granite and sur-mounted by a gran
. The street railway review . used in the Blackwell tunnel and the London and Glas-gow cable and electric railway tunnels, was contemplated, but theadvance in the cost of iron led the engineers to consider concrete,and this material will be used to such extent as the conditions de-veloped «n building shall warrant. Section A of the tunnel is in Maverick .Sq. and Lewis St., EastBoston. The structure is for two electric railway tracks and con-sists of 139 ft. of open incline and 680 ft. of wide arch subway. Theside walls of the incline are of concrete laced with granite and sur-mounted by a granite coping. Granite also surrounds the covered portion of the section is a concrete monolith. Nutsand washers are imbeded in the masonry to admit of the use of steeltie-rods for increasing the strength of the roof if deemed section is on a grade of 5 per cent and at the deep end the bot-Inni of the masonry invert is 39 ft. below the surface of the street. 114 STREET RAILWAY REVIEW. [Vol. XI, No. INCLINE AND PORTAL, EAST BOSTON TUNNEL. Work was btgiin May 5, 1900, and completed in the latter part ofNovember. Section B extends from the end of Section A in East Boston to alittle beyond Prince St. in Boston, a distance of about 443° fcWork was begun Aug. 13, 1900, and the section is to be completedJune IS, 1903. The tunnel will be an arched structure for two elec-tric railway tracks. The portion under the harbor will be about20/2 ft. high inside and about 23 ft. wide, and about 2,250 ft. long,and has walls of 33 in. and upwards in thickness. The tunnel onthe East Boston side has grades of from to 5 per cent and at a ^ ^^^^^R^^^^^^^^*^^^PS3H|^^^^^H ^ ^^^^^^^^^H ^HH -jji^gBy 1 ^p ^^^H ^^^^1 ^K^^^^SSiSn^ > IX^ il ^^^^^^^^^^^B ^^B^H^^^^^«^^H9l^^r f i4Mf^ 1 ^^^^^HB ^^t^HH^^T^ . • .t^ ^TivJ ^BR m. i_ ^^^^^^B 1 CHARLESTOWN IlKIIii;i; FKiiM CITY CHARLESTOWN. point 250 ft. soutliwestcrly from the Harbor Commissioners line isabout 100 ft. lower
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
