Morgan Allen's CSX St. Louis Sub
Morgan wanted a relatively simple, one-level railroad where he could mostly watch trains roll. This provides staging for up to six trains behind low barriers; trains can leave one staging yard, traverse the main, and end up in the other staging yard, then back behind the scenes back to their original location -- a fairly flexible system requiring no grades. The prototype is a scenic stretch of the CSX through Indiana; the tunnel is prototypical.