"During this deceleration, the wheel bearing failed," she said. "Car23derailed, and the train initiated an emergency brake application and came to a stop."
23 sauce:
https://www.ntsb.gov/investigations/Pages/RRD23MR005.aspx
https://www.ntsb.gov/investigations/Documents/RRD23MR005%20East%20Palestine%20OH%20Prelim.pdf