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 on October 27, 1904, the New York City Subway is one of the world's oldest public transit systems, one of the most-used, and the one with the most stations.
The New York City Subway is the largest rapid transit system in the world by number of stations, with 472 stations in operation. Stations are located throughout the boroughs of Manhattan, Brooklyn, Queens, and the Bronx.
The system has operated 24/7 service every day of the year (barring emergencies and disasters) throughout most of its history.
The New York City Subway is the busiest rapid transit system in both the Western Hemisphere and the Western world, as well as the ninth-busiest rapid transit rail system in the world. In 2017, the subway delivered over 1.72 billion rides, averaging approximately 5.6 million daily rides on weekdays and a combined 5.7 million rides each weekend (3.2 million on Saturdays, 2.5 million on Sundays). 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 en.wikipedia