FILE - In this Dec. 30, 2013 file photo, a fireball goes up at the site of an oil train derailment in Casselton, N.D. Rail cars being used to ship crude oil from North Dakota's Bakken region are an "unacceptable public risk," and even cars voluntarily upgraded by the industry may not be sufficient, a member of the National Transportation Safety Board said Wednesday, Feb. 16, 2014. The cars, known as DOT-111s, were involved in derailments of oil trains in Casselton, N.D., and Lac-Megantic, Quebec, just across the U.S. border, NTSB member Robert Sumwalt said at a House Transportation subcommittee hearing. (AP Photo/Bruce Crummy, File)
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