In this Aug. 8, 2012 photo, a DOT-111 rail tanker passes through Council Bluffs, Iowa. DOT-111 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 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/Nati Harnik, File)
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