Since the IRT tunnels, sharper curves, and stations are too small and therefore can not accommodate B Division cars, the IRT remains its own division, the A Division.
The New York City Transit Authority (NYCTA), a public authority presided by New York City, was created in 1953 to take over subway, bus, and streetcar operations from the city, and placed under control of the state-level Metropolitan Transportation Authority in 1968.
and exhibited his idea for a subway propelled by pneumatic tube technology.
The tunnel was never extended for political and financial reasons, although extensions had been planned to take the tunnel southward to the Battery and northwards towards the Harlem River.
Stations are located throughout the boroughs of Manhattan, Brooklyn, Queens, and the Bronx.