CBS News | Railroad reveals cause of fiery oil train derailment CBS News MOSIER, Ore. -- At least one broken bolt holding the rail in place caused the fiery derailment of a Union Pacific train moving volatile crude oil through the Columbia River Gorge on the Oregon-Washington border, railroad officials say. Union Pacific ... Broken lag bolt caused oil train derailment, UP officials say Mosier mayor wants feds, Oregon to hit brakes on oil trains Officials: Multiple broken fasteners led to Mosier oil train derailment, explosion |