Tim DePaepe, an investigator with the National Transportation Safety Board, accompanied by Chicago Transit Authority President Forrest Claypool, right, speaks during a news conference Monday, March 24, 2014, at Chicago’s O’Hare International Airport in Chicago. The NTSB is leading an investigation into why an eight-car Chicago public-transit train jumped the tracks, skidded across a platform and scaled an escalator that leads to one of the nation's busiest airports early Monday, injuring 32 people. (AP Photo/Carla K. Johnson)
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