Pieces separated from the fireball to begin to form the train and were distinctively white while the fireball was variations of green with no white. The train appeared to "glow" more than "smoke" and was yellow, yelow/orange in color.
Terminal flash
Observation
Yes
Remarks
It's what initially caught my eye. But it was in my peripheral vision.
Fragmentation
Observation
Yes
Remarks
After the flash ended and it became apparent that it was a moving object it was about 3 seconds before the fragmentation began. The fragments were white while the fireball was always green.
