Even excursion car 103 has remnants of the Edaville steam heat. (In the winter, the excursion cars were covered with clear vinyl. I remember riding in them, and the "windows" would fog up with condensation.)
I think we should reinstall stoves into our cars. For safety purposes, however, they would probably have to be "powered" by something other than coal or wood. Maybe a kerosene heater (like the ones we use now with the automatic shutoff) but shaped/enclosed to resemble the cast iron original?