There is a picture and I know somewhere on the East Coast it still exists, is a steam powered bicycle, I thinks its pre-1900's and uses a cast iron boiler, where the engine would be on a conventional motorcycle. You stoked up the fire box under the boiler and had roughly 10 minutes of water or steam which ever ran out first.
I know from the coal powered water heater I used in Europe, it looked like a tall fire extinguisher, you'd get it filled with wood or coal, light it up and the water would get hot, a good 5 minute shower. If you got cold, you would lean out and throw some more wood on the fire and the water would get warm again.
Reminds me of the wood gas truck my grandfather drove in Europe during the war. Hey we could all be driving around in one of the air powered vans in India, 100 miles to 4 compressed cylinders of air.