Ralph McAllister built an amazing train set in the 50s and 60s in Boulder, Colorado. Mac's work was absolutely unsurpassed, and I've found a site where his hand built Mallet 4-8-8-4 is for sale. It's a "large" scale, and at 32' long and 18,800 lbs it's a velvet hammer. I'm taller than the stacks at the front. It's a Michaelangelo wrought in iron, if there ever was such a thing. Every piece was made by hand.
I think his "train set" should be in a museum somewhere. So who's got an extra $100,000 to make it happen?
Mac's Mallet 4-8-8-4
Rest in Peace, Mac.