new contracts

The Dual Contracts, also known as the Dual Subway System, were contracts for the construction and/or rehabilitation and operation of rapid transit lines in the City of New York. The contracts were signed on March 19, 1913, by the Interborough Rapid Transit Company and the Brooklyn Rapid Transit Company. As part of the Dual Contracts, the IRT and BRT would build or upgrade several subway lines in New York City, then operate them for 49 years.
Most of the lines of the present-day New York City Subway were built or reconstructed under these contracts. The contracts were "dual" in that they were signed between the City and two separate private companies. Both the IRT and BRT (later Brooklyn–Manhattan Transit Corporation, or BMT) worked together to make the construction of the Dual Contracts possible.

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