Word: tunnel
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Dates: during 1910-1919
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...tubes have been cleared and are now ready for the tracks. These will be laid at once and it is hoped that the electrification will be completed during the summer. However, the cars cannot be run in the Cambridge division until the Transit Commission has finished the Beacon Hill tunnel now under construction. The Elevated Company, which is doing the Cambridge work, anticipate that their division will be completed well in advance of the other section, probably some time in the early fall. At that time that surface cars will be moved back to Massachusetts avenue from Mount Auburn street...
...three stations will be free transfer points from surface cars. Except for a few hundred feet to the west of Harvard square, the subway will consist of two tubes 16 feet high and 25 feet broad, situated on different levels as in the case of the Washington street tunnel, the out bound track to be the higher...
...provided at every 1000 feet and furnish an easy way for people to find their way to the street in the case of emergency. Each of them is also to be used for ventilating purposes. Another innovation in subway construction is a system of underground sidewalks connected with the tunnel but outside the entrance gates at the Central square station. These sidewalks extend for about 350 feet on each side of the station. At Harvard square the walls at the point where the surface cars go down into the subway have been constructed of brick and sandstone in keeping with...
Except at the stations the subway consists of two tubes instead of a double-tracked tunnel. The trains passing in the tube put the air in circulation in one direction only, this making the ventilation better than it is in a double-tracked tunnel, where the trains, passing in opposite directions, neutralize each other and do not aid in the ventilation...