WATCH: Dramatic video of CTA train crash at O'Hare

Dramatic surveillance video has been leaked online of the CTA Blue Line derailment at O'Hare International Airport that injured 35 people early Monday morning.

The NTSB said Wednesday that the woman operating the train admitted she fell asleep before the crash, reports DNAinfoChicago. The NTSB said this wasn't the first time the driver, who had only been on the job for two months, had fallen asleep. 

The 44-second video, which appears to be a security camera, was not released Chicago Transportation Authority.