Wild video shows a San Francisco train driver falling asleep, sending screaming passengers falling to the floor as it accelerates to more than 50 miles per hour and almost crashes into a car.

The female MTA driver was seen slumped over in a chair when the packed two-car train hit a turn hard, accelerating out of a curve as a car quickly got out of its way, video obtained by KRON4 shows.

The fast turn threw riders to the side, with many flung to the floor. “I wanna get off!” one terrified woman wails as another yells, “Oh my God!”

The jolt also woke the driver, who was seen rushing to get control and bring the train to a halt. She then gets up to address the terrified passengers, repeatedly telling them to “relax.”

An investigation into the scare when the train was in the Sunset Tunnel near Duboce Park early Sept. 4 showed no problems with the train or track, the San Francisco Municipal Transportation Agency (SFMTA) said Monday..

Instead, it was confirmed to be “an error as a result of operator fatigue.”

The train “experienced a series of unexpected jolting movements while navigating a curve at an excessive speed of 50 mph,” the SFMTA said, without saying how fast it would typically be going at that point.

“Several passengers were jostled and fell due to the sudden motion,” the agency confirmed.

“The agency is addressing the matter in accordance with internal protocols and the relevant contract, which included placing the operator on nondriving status.”

SFMTA director of transportation Julie Kirschbaum called the incident “unacceptable.”

“We know this was a frightening experience for our riders, and we take that very seriously,” Kirschbaum said.

“Safety is always our top priority. We are committed to accountability in response to this specific unacceptable incident and we are taking all necessary steps to keep Muni safe and reliable for all riders and the public.”