So did defunct builders like Iron Fireman make engines for their geographical area and as coal fell out of favor they died and others survived because the coal infrastructure remained???
if yes -- you have a task to fill those shoes -providing stokers for each region.
Maybe its not worth it without coal suppliers - and who wants to supply coal if there is no good way to turn it into heat energy..
Chicken or the egg?
Looks like the design you have burning on Utube would work for Bit coal thats dusty lumpy "clinkery" with only a few tweaks by the local installer.
You need a large customer base to launch a build on or reintroduce a model - a little out of the strike zone isn't bad when coal is only 40 or 80 bucks a ton!
To get coal -- affordable coal -- Ill likely have to screen and crush the stuff that the power company burns so it will work in my little load. Its a possibility - still better than humping chunk wood - but maybe not better than burning the biomass mix that I do now?????