A 1910 plan for Interborough Rapid Transit's subway/elevated system (Triborough System), from the New York Times, December 6, 1910, Four-Borough Lines Offered by Interboro. The lines shown as under construction actually went to the BRT, and the IRT Lafayette Avenue line was not built (but the IND built a line there later); everything else was done.. As it was published before 1923, it's public domain.

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