FILE In this June 3, 2016, file image, from video provided by KGW-TV, smoke billows from a Union Pacific train that derailed near Mosier, Ore., in the scenic Columbia River Gorge. The nation's largest railroad has agreed to more thorough inspections and maintenance improvements after the fiery oil train derailment in Oregon and the discovery of more than 800 potential safety violations across its sprawling network. (KGW-TV via AP, File)
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