For now, though, steam engines are limited to a few niche applications and, of course, models built by enthusiasts. This one for example is built entirely in LEGO as a scale replica of a steam ...

The LEGO designers set a high goal and over delivered in each ... And if you examine its interior, you can see the piston steam engine that attaches to the propeller, the famed grand staircase ...

And you can also see the piston engines, which pump up and down when you turn the boat's propellers. LEGO recently retired its massive bulldozer set, but replaced it with a similarly priced ...

Lego and Oracle Red Bull Racing are ... Featuring authentic red, blue, and yellow livery, the 1,636-piece set includes a 2-speed gearbox, a powerful V6 engine and moving pistons.