Wikipedia: 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 Metropolitan Transportation Authority and also known as MTA New York City Transit. It is one of the oldest and most extensive public transportation systems in the world, with 468 stations in operation; 229 miles of routes, translating into 656 miles of revenue track; and a total of 842 miles including non-revenue trackage. In 2007, the subway delivered over 1. 562 billion rides, averaging over 5 million every weekday, 2.9 million on Saturdays, and 2.2 million on Sundays. The New York City Subway trails only the metro systems of Tokyo, Moscow and Seoul in annual ridership and carries more passengers than all other rail mass transit systems in the United States combined. Among the world's busiest metro systems it is the only one to run 24 hours a day, 365 days a year. The subway is currently undergoing renovation and expansion. Current expansion projects include the Second Avenue Subway on the Upper East Side of Manhattan, the 7 Subway Extension to the west side of Manhattan and the Fulton Street Transit Center. The South Ferry Terminal has been opened to passenger service, but is not yet completed.