FILE – This June 4, 2016, file aerial photo, provided by the Washington State Department of Ecology, shows scattered and burned oil tank cars after a train derailed and burned near Mosier, Ore. 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. (Washington State Dept. of Ecology via AP, file)