Manhattan Island's flinty length is skewered by two sets of tubes, its flat back mounted by three great overhead structures. The tubes all duck under the East River, bore deep into Brooklyn. One is run by Brooklyn-Manhattan Transit Corp. The other, a two-pronged affair stretching to The Bronx, is controlled by Interborough Rapid Transit Co. which also operates the elevated lines. New York City owns the tunnels and tracks, rents them under long-term leases to the operating companies.
Still another subway, parallel to and west of the present units, is being built by the municipal government. Its completion will bring the total...
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