A woman was struck by a train after she fell onto the tracks at a Manhattan station on Wednesday afternoon, police said.

The woman was struck shortly before 1:40 p.m. by a southbound 6 train at the Lexington Avenue-51st Street station, police said. She had fainted and fallen onto the tracks, they said. 

She was taken to Bellevue Hospital Center in critical condition, cops said.

There were service changes on the 6 and 5 lines as a result, but regular service resumed with delays at about 2:35 p.m., the MTA said.