It started as a blue streak, the train was maybe 70 feet behind. Then as it got closer to the tree line it turned bright white. ( the same glow as burning magnesium). At that point it started throwing off sparks. Then it disappeared it the horizon.
Terminal flash
Observation
No
Remarks
-
Fragmentation
Observation
Yes
Remarks
As I stated, I would guess at 5000 feet is when the sparks started separating from the glow.