Word: tubes
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Dates: during 1910-1910
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...method. As the name implies, the excavation is carried on from the surface. Cable-ways and hoisting machines, all electrically operated, are used as a means of removing the material, which is employed in reclaiming land along the Charles River. Through the Square the subway consists of two parallel tubes. The tube in which trains go toward Boston is of a slightly lower level than the other. This difference in level is to make it more convenient for passengers coming from Boston who wish to change cars for Newton and Arlington, and vice versa...
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...