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 between Staten Island and another borough must take the Staten Island Ferry or an MTA bus; free transfers are allowed to the subway and bus systems. The PATH 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.
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The system is also one of the world's longest. Overall, the system contains 236 miles (380 km) of routes, translating into 665 miles (1,070 km) of revenue track;and a total of 850 miles (1,370 km) including non-revenue trackage.
On September 23, 2014, more than 6.1 million people rode the subway system, establishing the highest single-day ridership since ridership was regularly monitored in 1985.
According to wikipedia
