Officials attend the launch of a Positive Train Control system for Los Angeles' Metrolink commuter trains in February 2014 at Los Angeles Union Station. Congress mandated the technology after a Metrolink engineer ran a red light while he was texting and crashed head-on with a freight train in 2008. Damian Dovarganes/AP hide caption

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Stanley Wrice pauses in December 2013 as he speaks to the media with his lawyer, Heidi Linn Lambros (left), and his daughter, Gail Lewis, while leaving Pontiac Correctional Center in Pontiac, Ill. Wrice was released after serving more than 30 years. He claimed for decades that Chicago police detectives under the command of then-Lt. Jon Burge beat and coerced him into confessing to rape. M. Spencer Green/AP hide caption

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Firefighters douse blazes after a freight train loaded with oil derailed in Lac-Mégantic in Canada's Quebec province on July 6, 2013, sparking explosions that engulfed about 30 buildings in fire. AFP/Getty Images hide caption

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Chicago Mayor Rahm Emanuel shakes hands at a campaign office Tuesday, as voters gave him a second term. He won a runoff election against Cook County Commissioner Jesus "Chuy" Garcia. M. Spencer Green/AP hide caption

itoggle caption M. Spencer Green/AP