FILE - In this July 9, 2013 file photo, workers comb through debris after an oil train derailed and exploded in the town of Lac-Megantic, Quebec, killing 47 people. The North Dakota Petroleum Council released a study Tuesday, May 20, 2014 at the Williston Basin Petroleum Conference and Expo in Bismarck saying Bakken oil is similar to other light crudes and does not pose a greater risk to transport by rail than other flammable liquids. Oil trains in the U.S. and Canada were involved in at least eight major accidents during the last year, including an explosion in Lac-Megantic,(AP Photo/The Canadian Press, Paul Chiasson, File)
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