The 145th Street subway station in Harlem closed briefly after a minor collapse of part of the platform.
The station is now reopened and subways are running again.
The south end of the platform on the southbound side of the No. 3 line was hanging over the tracks said sources.
No injuries have been reported.
There is ongoing construction at the station.
No. 3 train service was suspended between 96 Street and Harlem-148 Street