Just outside of Coshocton, Ohio sits a remarkable live steam railroad. The Mill Creek Central is a 7 1/2" gauge live steam railroad. Comprising over 25 scale miles of track, there are two tunnels, a bridge over a large creek and a very large tressel, not to mention two towns, a turntable and a locomotive repair shop. The railroad runs on signal indication lighting and to say it's spectacular is an understatement. Being owned by a private owner, the railroad is not open to the public.
Here are a few pictures of the Mill Creek Central. I've also included a skematic of the layout.