It looks like sabotage to me, based on the facts.
Too much smoke, smoke in too many places, too much damage of the wrong kind and in the wrong place for a simple derailment.
TWB
You call leaving an elevated railbed at over 200 mph a simple derailment?
Every point you made is wrong.
Put away your conspiracy theorist hat until you learn enough about simple physics to even try analyzing complex disasters.
See #68 for an introduction to analysis...