<Tr> <Th> (hide) System map </Th> </Tr> <Tr> <Td> <P> </P> </Td> </Tr> <P> The New York City Subway is a rapid transit system owned by the City of New York and leased to the New York City Transit Authority, a subsidiary agency of the state - run Metropolitan Transportation Authority (MTA). Opened in 1904, the New York City Subway is one of the world's oldest public transit systems, one of the world's most used metro systems, and the metro system with the most stations . It offers service 24 hours per day on every day of the year . </P> <P> The New York City Subway is the largest rapid transit system in the world by number of stations, with 472 stations in operation (424 if stations connected by transfers are counted as single stations). Stations are located throughout the boroughs of Manhattan, Brooklyn, Queens, and the Bronx . The Staten Island Railway is not officially considered part of the subway, as it lacks a rail link with the subway system, so passengers traveling to another borough take a ferry or bus; however, free transfers are allowed to the New York City Subway and the MTA's bus system . The Port Authority Trans - Hudson in Manhattan and New Jersey and the AirTrain JFK in Queens both accept the subway's MetroCard but are not operated by the MTA and do not allow free transfers . However, the Roosevelt Island Tramway does allow free transfers to the MTA and bus systems, even though it is also not operated by the MTA . </P>

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