I've been modelling GWR of and on for about 35 years. The railway I have under construction goes around a garage loft, the run is about 18ft X 10ft and includes a pit scene.
I have to say that it's been untouched for about three years, but i'm getting that yearning to do a bit more with it.
Most of the model is scratch built with a few loco kits. The rails are SMP Finescale with scratch built points which include double slips etc.
The couplings have all been changed to Spratt and Winkle.
I've posted two pictures of the loco sheds and just for fun the second picture i've Photoshop'd, (my son and I included) also a shot towards the pit.
I hope this is of some interest.