U.S. says CSX missed rail defect blamed for oil train derailment

A CSX employee walks on a locomotive while on a siding at Worthville, Ky., Oct. 11, 2013.
Luke Sharrett | Bloomberg | Getty Images

U.S. regulators on Friday said a February oil train derailment in Mount Carbon, West Virginia, was caused by a rail defect that CSX and its contractor missed during at least two inspections conducted months before the accident.