Its one more nice propoganda again to woe muslims by congress partyit was clear from the media reaction just after the incident took place.almost all media(print, TV, etc) have said the the doors of the coach S6 were chained and locked and then it was set fire by a mob of around 400 approx muslims .
If it was accidental then what 400 muslims doing at a small Godhra station at that time.
It was a pre-planned and well executed massacre by muslims against the innocent Hindu women and children returning from ayodhya.