https://www.ntsb.gov/investigations/AccidentReports/Pages/RRD18MR001-prelim.aspx

Inward-facing video with audio captured the crew’s actions and their conversations. A forward-facing video with audio captured conditions in front of the locomotive as well as external sounds.

The crew was not observed to use any personal electronic devices during the timeframe reviewed.

About 6 seconds prior to the derailment, the engineer made a comment regarding an over speed condition.

The engineer’s actions were consistent with the application of the locomotive’s brakes just before the recording ended. It did not appear the engineer placed the brake handle in emergency-braking mode.

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The recording ended as the locomotive was tilting and the crew was bracing for impact.

The final recorded speed of the locomotive was 78 mph.