This replica of the first Caterpillar (technically "Holt" the predecessor to Caterpillar) tractor ever sold was built by Don Hunter over nine years. The world of steam is rife with superlatives, so I'm not sure how to place the "first" claim here. Nevertheless, very cool build. He built the entire thing except for the original crankshaft.

"You've gotta feel the power of steam. It's awesome! And you gotta get the feel of the power of steam. And so, yeah, well, the only way I can do it is build my own. So this is why I did what I did." - Don Hunter

Scale model working Lombard Steam Log Hauler build
Lombard steam log hauler
Steam-powered submarine
1901 steam-powered lawnmower
Hornsby mammoth steam crawler tractor
1900 restored Fowler steam traction engine
Steam-powered tanks
Steam locomotive drag racing
Steam-powered machine shop