Shane, I saw that one aisle narrows quite a bit. You should be okay, though you could replace the curved section just below the current switch with a switch, so you would be going through the straight leg of the switch to the engine house and caboose track to make the aisle a little wider. I knew the Shawmut used 4-axel diesels so I assumed your inside loop curves are quite adequate. However, if you have Mikes to run like you mentioned to Chris, then you may want to try 042 curves and switches on the inside loop. I went with nothing smaller than 042 on my layout in the 11x11 room. They are just on my sidings.
Bruce, I'm glad to see you here!!!! That is a really sweet looking SW-9 you painted!! It and the caboose look great along your rock wall!
