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Smoke pours from the site of an oil train derailment Monday, Dec 30, 2013, in Casselton, N.D. The train carrying crude oil derailed near Casselton Monday afternoon. Several explosions were reported as some cars on the mile-long train caught fire. (AP Photo/Bruce Crummy) ( Train Derailment-Fire )

A train burns after derailing near Casselton, N.D., on Monday, Dec. 30, 2013. No one has been reported hurt in the derailment or fire. By late Monday afternoon, the smoke plume was diminishing and was staying mostly away from town. (AP Photo/Ken Pawluk) ( Train Derailment-Fire )

A fire from a train derailment burns uncontrollably as seen in this aerial photograph Monday, Dec. 30, 2013, west of Casselton, N.D. No one has been reported hurt in the derailment or fire. By late Monday afternoon, the smoke plume was diminishing and was staying mostly away from town. (AP Photo/The Forum, Michael Vosburg) ( Train Derailment )

A fireball goes up at the site of an oil train derailment Monday, Dec 30, 2013, in Casselton, N.D. The train carrying crude oil derailed near Casselton Monday afternoon. Several explosions were reported as some cars on the mile-long train caught fire. (AP Photo/Bruce Crummy) ( APTOPIX Train Derailment )

This photo provided by Cass County Commissioner Ken Pawluk shows a train derailment and fire west of Casselton, N.D., Monday, Dec. 30, 2013. No one has been reported hurt in the derailment or fire. By late Monday afternoon, the smoke plume was diminishing and was staying mostly away from town. (AP Photo/Ken Pawluk) ( Train Derailment-Fire )