In the next town to me Warner Robins has a Air Force base. Just out side the base on base property there is a BIG museum of aviation and they have a radial steam air plane engine there. It is just the engine. It is one heck of a museum with acres of planes.
http://www.museumofaviation.org/
One of my too many hobbies is collecting toy live steam engines not locomotives but steam engines most are stationary but some of steam tractors and wagons. I use to have over 175 engines and over 200 of the toys they drive from the late 1800 to present. Now I am down to only about 100 steam engines as I sold some.