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Associated Press
FILE - In this June 24, 2012, file photo, smoke rises from two cargo trains that collided near Goodwell, Okla. The National Transportation Safety Board meeting in Washington on Tuesday, June 18, 2013, is attempting to find a cause for the June 24, 2012, accident near Goodwell that killed three railroad workers.  (AP Photo/The Guymon Daily Herald, Trudy Hart, File)

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