In pictures: Commuter train derails in Chicago
A derailed Chicago Transit Authority train car rests on an escalator at the O'Hare Airport station early Monday, March 24, 2014, in Chicago. More than 30 people were injured after the eight-car train plowed across a platform and scaled the escalator at the underground station.Andrew Nelles/The Associated Press
A Chicago Transit Authority train car rests on an escalator at the O'Hare Airport station after it derailed early Monday, March 24, 2014, in Chicago.Kenneth Webster
National Transportation Safety Board Railroad Accident Investigator Tim DePaepe leaves a press briefing about a Chicago Transit Authority subway train that derailed at O'Hare International Airport in Chicago, March 24, 2014.JIM YOUNG/Reuters
National Transportation Safety Board Railroad Accident Investigator Tim DePaepe speaks at a press briefing about a Chicago Transit Authority subway train that derailed as CTA President Forrest Claypool (L) listens at O'Hare International Airport in Chicago, March 24, 2014.JIM YOUNG/Reuters
A worker puts up a tarp to cover the scene where a Chicago Transit Authority subway train crashed into a platform at O'Hare International Airport in Chicago March 24, 2014.JIM YOUNG/Reuters
A Chicago Transit Authority worker directs commuters to a shuttle bus after a subway train derailed at O'Hare International Airport in Chicago, March 24, 2014.JIM YOUNG