“A Failed Defect Detector and the Train Derailment at East Palestine”
The discussion of what might have caused East Palestine begins around the 2:45 mark. “Dave” is a veteran railroader and this video is well worth watching.
https://www.youtube.com/watch?v=_RNe3QW3aHI
A comment posted under that YouTube:
“Dave, I have confirmation that it WAS indeed a burned off journal. Inside wheel, and what’s causing all the sparks is the wheel is being pulled against the brake beam and causing the wheels to slide at high speed. The bearing was trending for 3 detectors prior, the dispatched failed to notify the crew. Like you had said this all started right after the Salem detector and by the time they got to the E. Palestine detector it was beginning to derail. They went into emergency before the engineer could react, and that’s all she wrote. This information comes directly from NS supervision at Conway yard, relayed to my my supervision.”
https://www.youtube.com/watch?v=_RNe3QW3aHI