Some people like to build working models of steam locomotives. This genre of model railroading is generally called "Live Steam". The models work exactly the same as "The Huge Engine" on the 1st floor, they're just smaller. Due to the size of the models, and the size of the required layout needed to run the models, there is oftentimes a club that owns the land for the layout and club members operate their own locomotives on the club's track.
Golden Gate Live Steamers in the Berkeley Hills (Orinda)