The crew of the freight train carrying dangerous chemicals that derailed in Ohio earlier this month received a warning about an overheating wheel bearing and tried to slow the train before it came off the tracks, according to an interim report released on Thursday by the National Transportation Safety Board (NTSB).
The wheel bearing was heating up for several miles before reaching 253 degrees Fahrenheit hotter than the air temperature, investigators found, a dangerous level requiring a train to stop to prevent disaster.
