FRED must have identified the defect that caused the accident, but somebody decided not to address it at the time.
The caboose has long since been replaced by the FRED unit, that little telemetry device on the rear of the train with the flashing red light. FRED communicates to the engineer and/or conductor via a mechanical voice identifying defects on the train. It also communicates to the dispatcher via trackside sensors as a fail-safe.
FRED must have identified the defect that caused the accident, but somebody decided not to address it at the time.
No, Fred didn’t do squat. Fred has no EYES to see what it happening. Fred only knows something AFTER it has happened. An acoustic detector signaled the issue.
Probably smoking pot. Wouldn’t be the first time.