Any Metalurgists out there?...

[Nostalgic]

Not a metallurgist, but I do know that with something in a fire like that, there are a lot of variables. Just because the wheels melted doesn't mean the rest of the frame hit 1200F. The tires burning produces enough local excess heat to do that. Metal harness can be checked, but I don't know how they do it, or if it can be done in the field? Wiring intact, as in still has insulation, or the copper is still there?