Fred;
Those coaches look so nice. It is hard to believe that they are 100 years old. I'm only 72, but do not look near as good as those coaches.
I read that the earlier tinplate was actually dipped into molten tin. It tended to hold up better than the later, electro-plated tinplate.
I built a tincup car to go with my tinplate equipment, but unfortunately, I don't have any Number One gauge tinplate - only O gauge.
Best wishes,
David Meashey