I sadly couldn't draw much up, but suffice to say, I will be having a 1-track entrance while a kickback houses a restoration shed with a Kirk kit in it, with only some wheels... The main station will be two 'voies' with no run round, requiring a loco to be stationed in the coach works siding, releasing any trapped loco, shunting back into the tunnel (This is a Prototype for Everything, as NVR visitors will testify to.). The train then pushes back in, this time into the other platform. Of course, the train can disappear into the tunnel not to return for a while... I should think that a goods yard would be beneficial, with two roads. The signal box will be a 'teaching box' for visitors.
I would like to suggest that light railways were not nationalised and axed, but operated by the remnants of the Big Four (The London and North Eastern Branch Railways Company anyone- LNEBR?) but BR still had a grip over them, so when funding ceased, they sold all their assets to preservationists and the staff retired in comfort.
So coming up to now, the network of branches from 'Kelton' and 'Woodbridge' are run by 'Itton Valley Railways'. IVR has its own way of working, explained later. I will explain in due course.