If you ever get a chance, Tom, check out some of the weird-ass steam engine types that have been invented over the years. I once attended this annual "Steam and Gas Engine Show" near here, and there were all kinds of very strange steam engines from the past 150 years or so running, and some of them seemed to have very whimsical and unexpected ways they ran, and they made these crazy stuttering hiccuppy syncopated heehaw sounds as they did so...it almost made you laugh to watch and listen to them, because it seemed like they were a joke. You were tempted to think, "Naw, somebody's pulling my leg here...there was never a steam engine that worked like THAT...was there?" I just wished the owners were around, so I could ask them "what type of steam engine is this?" so I could look them up later on the Web...it seems like there was quite a variety of "cycle types"...
They also had some really large locomotive-type steam engines in farm tractors and fire engines, and to hear the exhaust steam CHUFF-CHUFFing out of those things was truly impressive, it was almost scary because you could just hear the power and your brain was like "LOOKOUT!"
One cool thing about steam engines is that you can run a lot of them as slow as you want, and they're like bulldozers...the harder the work resists, the harder they push. Ain't much in the world that's stronger than water and heat!