[glinscott]

That's great. There is also this effort in New Zealand: https://mackwelloco.com/, focusing on "Modern Steam" techniques, with a small engine, targeting areas without easy access to diesel.

A good overview of modern steam techniques is here: http://advanced-steam.org/5at/principles-of-modern-steam/, where they focus on dramatically more efficient and clean burning engines. A fascinating rabbit hole to go down :).