The repair bill for damage caused by Sunday’s saboteur-inflicted subway train derailment is “approaching $1 million,” the MTA said.

The tab includes around $100,000 for repairs to the West 14th Street station plus “several hundred thousand dollars” to reconstruct the derailed train, a transit official told The Post.

Demetrius Harvard, 30, was apprehended shortly after the collision and held on $50,000 cash bail for allegedly hurling metal construction debris onto the tracks as an A train approached around 8:20 a.m.

The train flew off the rails and sideswiped at least 10 steel beams in the middle of the tracks, which caused a huge chunk of metal on the train itself to peel away.

MTA crews worked overnight Sunday to repair the station. Officials said A train service resumed at 6 a.m. Monday.

It was not Harvard’s first run-in with the MTA: In September, Harvard was hauled before a Manhattan Criminal Court judge for misdemeanor criminal mischief for allegedly striking an MTA bus with a metal street barricade, shattering two windows, The Post reported.

Harvard was freed without bail on supervised release.