Interesting sound description, and from that I think most of the locomotives going past my house are EMDs - much constant annoying drone.
Jay Leno owns a few steam cars. The videos he has on them are very interesting. Of course they're single gear and the starting sequence is complex compared to gasoline or diesel cars (even of that period), but the operation is simple and the torque on them is immense, with very smooth operation. He's referred to it as "The hand of God" before. It makes me want to build one at some point. They're not inherently difficult to build, something that really you could do from somewhat regular parts and simple machining, unlike a car engine which you really couldn't machine from scratch.