Looks like Mine Train may be down for bit. Hopefully nothing too expensive was damaged and they can get it up and running soon. Everyone's best guess right now based on timing and location is that it was started by fireworks fallout.
http://myfox8.com/2014/11/01/seven-d...-disney-world/
Later edit: Supposedly there are reports that it was back up and running tonight, but I can't imagine what managers or fire department would sign off on that, no matter how "cosmetic" the damage is.