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The New York City Subway is a rapid transit system that serves four of the five boroughs of New York City, New York: the Bronx, Brooklyn, Manhattan, and Queens. Its operator is the New York City Transit Authority (NYCTA), which is controlled by the Metropolitan Transportation Authority (MTA) of New York.
The New York City Subway system has, for the most part, used block signaling since its first line opened, and many portions of the current signaling system were installed between the 1930s and 1960s. These signals work by preventing trains from entering a "block" occupied by another train.
Two maps were drawn that showed routes for a never-built proposed expansion of the New York City Subway: one in 1929 and one in 1939. A subway map was also drawn up in the 1970s to illustrate planned service patterns for an expanded subway system.
The early IRT system consisted of a single trunk line running south from 96th Street in Manhattan (running under Broadway, 42nd Street, Park Avenue, and Lafayette Street ), with a southern branch to Brooklyn. North of 96th Street, the line had three northern branches in Upper Manhattan and the Bronx.
New York City, being the most populous city in the United States, has a transportation system which includes one of the largest subway systems in the world; the world's first mechanically ventilated vehicular tunnel; and an aerial tramway.
Since the opening of the original New York City Subway line in 1904, and throughout the subway's history, various official and planning agencies have proposed numerous extensions to the subway system. The first major expansion of the subway system was the Dual Contracts, a set of agreements between the City of New York and the IRT and the BRT.
The IRT was purchased by the city in June 1940, along with the younger BMT and IND systems, to form the modern New York City Subway. The former IRT lines (the numbered routes in the current subway system) are now the A Division or IRT Division of the Subway.
The third, the public Independent Subway System (IND) was owned and operated by the City of New York. The IRT and BMT systems were acquired by the city on June 1, 1940, for $317,000,000 and consolidated with the IND into the New York City Board of Transportation (NYCBOT).
The present New York City Subway system inherited the systems of the Interborough Rapid Transit Company (IRT), Brooklyn–Manhattan Transit Corporation (BMT), and the Independent Subway System (IND). New York City has owned the IND since its inception; the BMT and IRT were taken over by the city in 1940. The former IRT system is now known as ...
The New York City Subway began to provide underground cellular phone with voice and data service, and free Wi-Fi to passengers in 2011 at six stations in Chelsea, Manhattan. The new network was installed and owned by Transit Wireless as part of the company's $200 million investment.