The freight train derailment in eastern Ohio involved a wheel bearing that overheated without initially triggering an alert, according to a preliminary report by federal safety investigators
Tannen Maury/EPA-EFE/Shutterstock
“Norfolk Southern should re-examine their bearing criteria to include the rate of increasing temperatures between readings,” saysWithin the privatised US freight rail system, freight railroad companies set their own temperature thresholds for the wayside detectors, which are also known as hot box detectors. The US Federal Railroad Administration, which creates and enforces US rail safety regulations, does not currently set standards for such detectors.
Only the third detector located near the East Palestine derailment site sent a warning to the train crew after recording a temperature that was more than 253°F above ambient temperature. “This one appears to have gone about 30 miles before failure, which was plenty of time to set the car out at a siding,” says Quimby. “Bearings that increase in temperature as progressively as this one don’t usually get cooler.”
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