Don't recognize it, but most certainly looks to be one hefty steam engine. What is the bore on that beast?
Reeves and Cole come to mind, but I don't think it is either. Probably not a "Little Engines" model either.
Perhaps Gil, or some other more knowledgeable person will chime in here before too long.
Whatever it turns out to be, congratulations on acquiring what is clearly a big and capable engine of such impressive dimensions!