There are three types of model steal locomotives I would like to build: 1) a relatively large 1/10th scale railroad locomotive (model of just about any of the really large ones) and use it to ride around a track built on my acreage, 2) a much smaller (1/15th or 1/18th scale) traction steam locomotive like farmers used to use to pull the first 10-bottom plows, and 3) a smaller model (1/20th scale) railroad locomotive. Actually, the model traction steam locomotive is probably the first one I would try to build. The original ‘steam engine’ tractors were very impressive and there is a large museum here with several actual machines to base the model on.