June 3, 2016 oil train derailment on the Columbia River at Mosier, Oregon. Paloma Ayala photo
The investigation into June’s fiery Union Pacific oil train derailment at Mosier, Oregon found the accident was caused by broken lag bolts that hold rails onto railroad ties.
Those broken bolts weren’t found by Union Pacific’s existing rail inspections.
Under the agreement with the Federal Railroad Administration, Union Pacific says it will inventory sharp rail curves secured by lag screws or spikes.
The railroad also agreed to do walking inspections of sharp rail curves secured by lag screws every 4 months.