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

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A fireball goes up at the site of an oil train derailment in Casselton, N.D., in this Dec. 30 photo. The fiery crash left an ominous cloud over the town and led some residents to evacuate. Bruce Crummy/AP hide caption

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An injured man who was on a subway train that derailed Tuesday in Moscow talks on his phone after being treated by paramedics. Dmitry Serebryakov/AFP/Getty Images hide caption

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A train passes by the scene of repair efforts Tuesday at the site of a train derailment in the Bronx borough of New York. Seth Wenig/AP hide caption

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Monday, as a train on an unaffected track passed by (in the background) work continued on removing the commuter cars that derailed the day before. Mark Lennihan/AP hide caption

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Search and rescue teams work at the scene of Sunday's passenger train crash in the Bronx. The train crash killed four people and injured dozens more. Craig Ruttle/AP hide caption

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Emergency personnel respond to the scene of a train derailment in Santiago de Compostela, Spain. Antonio Hernandez/El Correo Gallego via AP 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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A still image from a video posted by Eastern Truck and Trailer captures a moment just before a commercial truck's trailer was struck by a freight train Tuesday. ETT Corp/YouTube hide caption

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