Interborough Rapid Transit Company
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The Interborough Rapid Transit Company (IRT) was the operator of the original New York Subway line that opened in 1904 and additional rapid transit lines in the City of New York.

The IRT was purchased by the City in 1940. The former IRT lines are now the IRT Division of the New York City Transit Authority, also known as the A Division.

The original article can be found at: http://en.wikipedia.org/wiki/Interborough_Rapid_Transit_Company.
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