I just got caught up on this thread. A very impressive layout you've got Peter! I also like your collection of motive power, all very nicely finished. I'm also a big fan of the SD7, (It's the only N scale engine I have after selling off the rest of my small scale stuff).
The last selection of photographs are all of the Benson end of the layout.
The service station behind the store with a tow truck and the John Deere tractor receiving attention. The lead track to the flour mill runs behind the corrugated iron fence.