FILE - In this Monday, March 24, 2014 file photo, a Chicago Transit Authority train car rests on an escalator at the O'Hare Airport station after it derailed, injuring more than 30 people, in Chicago. Had the crash occurred during the day, when the trains are often full and the escalator packed with luggage-carrying travelers, far more people likely would have been injured, some even killed, said Joseph Schwieterman, a transportation expert at DePaul University. (AP Photo/Andrew A. Nelles, File)
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