A preliminary NTSB report, along with additional details shared by officials together offered the most detailed explanation yet of what may have sent the train off the tracks.
stopped short of declaring a conclusive cause of the derailment. But the report, along with additional details shared by officials, together offeredNorfolk Southern train 32N, a 149-car, 9,000-foot-long train traveling east along the railroad's Fort Wayne Line across Ohio, derailed near East Palestine just before 9 p.m. on Friday, Feb. 3.
Cited in the NTSB's report was data collected by Norfolk Southern defect detectors, devices built along railroad lines with sensors that detect and report problems with signals and axles as trains pass by.were located along 30 miles of track near East Palestine. They recorded increasing temperatures in the suspect wheel bearing, investigators said.
The third and final detector, located 19 miles later just east of East Palestine, recorded such a high temperature — 253 degrees Fahrenheit above ambient temperature — that the train's crew was alerted to stop the train and inspect the bearing in accordance with Norfolk Southern safety guidelines, the NTSB report said.On hearing the alarm, the engineer"responded immediately" to begin bringing the train to a stop, Homendy said, but as the train decelerated, the wheel bearing failed.
Investigators are still examining the axle and wheel bearing, along with parts of the tank cars that carried toxic chemicals. The NTSB will also review Norfolk Southern's safety equipment and procedures, officials said. The spacing of hot-box detectors and the temperatures at which they trigger alarms are not currently regulated by federal law, officials say.
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