The National Transportation Safety Board says a Chicago commuter train was traveling at a normal 25 mph before it crashed, jumping its tracks and screeching up an escalator at one of the world’s busiest airports.
Investigator Ted Turpin says the assessment is based on a preliminary review of Monday’s derailment at O’Hare International Airport.
He says an automatic emergency braking system was activated on the tracks as the train traveled toward the platform, but it failed to stop the train.
More than 30 people received minor injuries during the accident that took place around 3 a.m.
Officials plan to speak with the operator Tuesday afternoon.
The union representing the train operator has said fatigue may have played a role in the crash at the nation’s second busiest airport.