Steam locos! As a kid I got a ride on a cog-wheel coal-fired (musta been a tourist thing) up a mountain in New Hampshire. The smell of coal smoke and cinders is still with me.
First overseas tour in Germany - early 1960's - there were still many rural freight runs using coal-fired steam. That was before the movie, "The Train" about efforts to stop the Wehrmacht from looting French art treasures. I was able to reconstruct the oil, cinder and ash fragrance - which was missing from the excellent filming.
So, we need bigger vans to transport our big-engine stunters? Just consider what these live-steamer hobbyists need to set up...