FILE - In this June 5, 2012, file photo provided by Rangeland Energy, LLC, a train leaves the company's crude oil loading terminal near Epping, ND. The percentage of North Dakota oil shipped by

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FILE - In this June 5, 2012, file photo provided by Rangeland Energy, LLC, a train leaves the company's crude oil loading terminal near Epping, ND. The percentage of North Dakota oil shipped by pipelines has slipped in the past year as producers preferred rail to reach coastal U.S. refineries that pay premium prices based on foreign crude. The North Dakota Pipeline Authority Director says rail shipments made up three-fourths of the record 794,000 barrels of oil produced daily in April, 2013. (AP Photo/Rangeland Energy, LLC, File) less 

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Associated Press
Thu, Jun 20, 2013 10:39 PM EDT