The New York City subway system runs 24 hours a day, 365 days a year. It never closes.
However, certain stations may close for the night, if the only trains that stop at them don't run during the night. The only example I can think of offhand is the City Hall Station on the R train (of the N-R-Q-W, the yellow line).
The City Hall Station is in Lower Manhattan. Late nights (11 PM to 5:30 AM) the R runs only in the southern half of Brooklyn (the Sunset Park and Bay Ridge neighborhoods). And the R is the only train that stops at the City Hall Station. So I would assume they lock the station up from 11 PM to 5:30 AM, so people don't enter the station, pay their fare, and then end up waiting for a train that's not going to come for several hours.
But, I don't frequent the City Hall Station (I don't think I've ever passed through it, even) so I can't say for sure.
24/7
but service gets a bit different at rush hours, late nights, and weekends
Subway restaurants are on every corner just about. Now the subway system runs underneath the city, especially Manhattan, and stations are on about every other block.
New York City Subway, or just the subway, or MTA.
Queensboro Plaza - New York City Subway - was created in 1917.
The New York subway system currently has 468 underground stations. It is the largest in the world and an average 5.4 rides take place every single day.
At subway stations, certain bus stops and even grocery stores and check cashing outlets.
South Ferry loops - New York City Subway - was created in 1905.
World's Fair - New York City Subway car - was created in 1938.
South Ferry loops - New York City Subway - ended in 1977.
Every station on the New York subway has service 24 hours every day. The night trains may be different from daytime service--for example, the A train runs express and skips stations during the day, but runs local and stops everywhere at night.
New York City transit services offers a subway system and buses. The subway is call "NYC Transit Subway" and the bus systems are "New York City Transit" and "MTA Bus".
No. NYC subway operates in NYC.
On October 27, 1904, the first branch of the Interboro Subway opened. It later expanded, and the BMT and IND companies (the IND was run by the city) came into Manhattan. More information is available at: www.nycsubway.org