Really, external-combustion steam power is an idea that ought to be on the road today. If this technology had been developed alongside the Otto cycle engine, we would have some truly modern and truly efficient designs today.
Gotta love the torque curve on those bad boys. They make peak torque from a standing start...
Steam is water vapor, a greenhouse gas dozens of times more potent than even the hideous carbon dioxide. I’m sure that the enviro-wackos would not approve.