The Southeastern Pennsylvania Transportation Authority tests its Positive Train Control system at the agency's rail yard near Malvern, Pa. The system will cost SEPTA about $328 million. The regional passenger railroad is one of the few in the country that are on track to meet an end-of-the-year deadline for installing PTC. Jeff Brady/NPR hide caption

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Oil trains sit idle on the BNSF Railway's tracks in Chicago's Pilsen neighborhood. David Schaper/NPR hide caption

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Emergency workers stand near a burned-out SUV that was struck Tuesday night by a Metropolitan Transportation Authority Metro-North Railroad commuter train near the town of Valhalla, N.Y. Mike Segar/Reuters /Landov hide caption

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At a school in Lac-Mégantic, Quebec, the town's people have been waiting for word about their friends and family members. Christinne Muschi /Reuters /Landov hide caption

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