A video recording in the train cab that could have provided crucial information about the East Palestine derailment was largely recorded over and thus is lost, the head of the agency investigating the crash says.

While the camera in the locomotive has 12 hours of recording time, “all of that – except 15 minutes before the derailment and 5 minutes after – was overwritten after the accident because they put the locomotive immediately back in service,”

https://abc6onyourside.com/news/local/most-of-norfolk-southern-video-leading-up-to-east-palestine-derailment-is-gone-national-transportation-safety-board-wayside-defect-detectors-transportation-ohio