I'll give you what I know.  It's a double cylinder wood burning, rear mounted, (more then likely was used for plow pulling) engine.  I spoke with the granddaughter (she's in her mid 70's) of the original owner who bought the tractor.  She told me that her grandfather bought the threshing machine in 1910 and the steam tractor was bought before the threshing machine.  Please let me know if you are looking for anything else.