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Popular Science Monthly
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���New York's Two- Storied Subway
��While train after train. loaded with passengers ran into Times Square station of the New York sub- way and out again, and while millions of persons on foot and in vehicles of every character passed over the spot on the surface, a new, four-track subway
��to be operated by the Brooklyn Rapid Transit Co., was constructed, crossing 42nd Street under the tracks of the old subway. Can you realize the tre- mendous difficulty of the engineering task involved in the gigantic undertaking? Read how it was done.
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