A possible scenario if through trains had continued over the S and D for a bit longer, stalwarts such as a 7F mix with some diesels that could conceivably have appeared. Don't take it too literally, it's just a "what if".
Hopefully visible to most of you:
Having relaid and remodelled some of the track at the end of 2016, I left it a few months to see if I was happy with it all. Eventually, this autumn, I decided crack on with bits of scenery (see photos) and some ballasting (50/50 water/ pva, a few drops of washing up liquid and some black poster paint to weather it a bit). The shed areas had black poster paint added later to try to reproduce the grime of such areas. There is still a lot to do, but I'm pleased with the progress so far.