Officials from the National Transportation and Safety Board announced on Wednesday that the operator of the train that crashed into an escalator inside O'Hare International Airport fell asleep at the controls.

According to CNN, the operator of the Chicago Transit Authority Blue Line dozed off early Monday morning, causing the train to veer off the rails and hit escalators leading to the airport's terminals. Although 32 people were hurt in the accident, none of the injuries were serious. There were no deaths.

Investigator with the NTSB Ted Turpin told CNN on Wednesday that there were two backup systems that should have come to the train's aid, but did not.

The driver, a CTA employee for just two months, reportedly awoke with a start to watch the lead car crash into stairs and escalators by the end of the track at about 2:52 on Monday.

But Turpin said an emergency braking mechanism that should have stopped the eight-car train immediately didn't deploy properly.

Turpin said this wasn't the first time this particular driver fell asleep at the controls, and that she was "very forthcoming" in her acknowledgment of responsibility for the incident.

"She dozed off prior to entering the station," Turpin told CNN. "She did not awake again until the train hit close to the end of the bumper."

But the train was wired to stop on its own, should the driver lose control of steering and acceleration.

"There is an electrical brake, and there's a disc brake system on the train, and there's a third track brake," Turpin continued.

Although the trip arm did engage, it didn't stop the train in time.

Video footage captured Monday's derailment - the YouTube spot shows the train entering the Chicago airport's station, then slamming into a bank of escalators.