, see Accessibility of the Metropolitan Transportation Authority § New York City Subway.
The New York City Subway is a rapid transit system that serves four of the five boroughs of New York City in the U.S. state of New York: the Bronx, Brooklyn, Manhattan, and Queens. Operated by the New York City Transit Authority under the Metropolitan Transportation Authority of New York, the New York City Subway is the busiest rapid transit system in the United States and the seventh busiest in the world, with 5.225 million daily riders. The system's 472 stations qualifies it to have the largest number of rapid transit stations in the world.
Three rapid transit companies merged in 1940 to create the present New York City Subway system: the Interborough Rapid Transit Company (IRT), the Brooklyn–Manhattan Transit Corporation (BMT), and the Independent Subway System (IND).