A Brooklyn teen lost his right leg after getting hit by a subway train while he was scrawling graffiti, a police source said yesterday.

José Juarez, 16, was on the tracks of the Kings Highway station at around 10:30 p.m. Saturday when the N train struck him, sources said.

He was rushed to Lutheran Hospital, where he was recovering last night.

“It’s a miracle that he’s still alive,” said the family’s pastor, Jonathan Brean.