Annual Report of the Boston Transit Commission, for the Year Ending .. 6th (1900)
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Palmer, Assistant En- o-ineer ; William O. Wellington, transitman ; Samuel Rosnosky, John H. Graham, rodmen. Date of contract. Date of beginning excavation (shaft in Lewis street). D.ate of completion named in contract. June 28, 1900. Aug. 13, 1900. June 15, 1903. General Description of Proposed Structures.- — The tun- nel will be an arched structure for two electric railway tracks. The portion under the harbor will be about 20^ feet high in- side and about 23 feet wide and about 2,250 feet lon...g, and has walls of 33 inches and upwards in thickness. The tunnel on the East Boston side has grades of from 4.7 to 5 per cent, and at a point 250 feet southwesterly from the Harbor Commissioners' line is about 100 feet lower than in Maverick square. A length of about 1350 feet in mid harbor is nearly level. Grades of 5 per cent, occur on the Boston side but are of short lengths owing to the intervention of the Com- mercial-street station. At this point the platform for the west-bound cars is immediately above that for the east- bound, their depths below the street being respectively about 50 and ^'o^ feet.
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