"FILE - In this Aug. 8, 2012 file photo, DOT-111 and AAR-211 class rail tankers pass by on the background as a man works at the Union Pacific rail yard in 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) Photo: Nati Harnik, Associated Press"
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