The Interborough Rapid Transit Company (IRT) was the private operator of New York City's original underground subway line that opened in 1904, as well as earlier elevated railways and additional rapid transit lines in New York City. [2]

The A Division, also known as the IRT Division, [2] is a division of the New York City Subway, consisting of the lines operated with services designated by numbers (1, 2, 3, 4, 5, 6, 7) and the 42nd Street Shuttle. [3] These lines and services were operated by the Interborough Rapid Transit Company before the 1940 city

1934年，BMT、IRT、IND的勞工成立名為「Local 100」的運輸勞工工會（英語： Transport Workers Union，TWU ），至今有三次罷工紀錄： 首次發生於1966年，罷工12天。 第二次發生於1980年，罷工天數達11天。

The IRT Lexington Avenue Line (also known as the IRT East Side Line and the IRT Lexington–Fourth Avenue Line) is one of the lines of the A Division of the New York City Subway, stretching from Lower Manhattan north to 125th Street in East Harlem. The line is served by the 4, 5, 6, and <6> trains.

The Interborough Rapid Transit Subway, or IRT, was the first subway company in New York City. Even with elevated train lines springing up around the city, the need for an underground rapid transit railroad was obvious as a solution to street congestion and to …

The IRT, or Interborough Rapid Transit Company, was the operator of the city's first subway system, which was built by the city and operated under contract. As we have already read the Interborough also took over ownership and operation of the Manhattan elevated lines about the time the subway was opened for service.

The IRT line on the East Side of Manhattan is made up of portions of several different subway construction contracts, including the 1904 Contract I "First Subway" from City Hall to 33rd Street, three 1905 Contract II Brooklyn Extension stations, and, from Grand Central northward, eleven 1918 Contract III, or "Dual Contracts" stations.

限界较小的A系统使用的列车，车体长度一般为15.5m，宽度一般为2.6m——自古（有IRT）以来便是如此，没怎么改变过。 限界较大的B系统 情况稍微复杂一些，在BM(R)T还存在的时代，BM(R)T使用的车体制式 比较混乱 。

The Interborough Rapid Transit Company (IRT) was the first operator of the original underground New York City Subway line that opened in 1904, as well as other earlier railways and rapid transit lines in New York City.

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