Today, whilst bored at work, I had the idea to do Potto Station, as I know it, and it lends itself to a two sided board. Straight in at the bottom, and through the station turning right round the back of the yard and off.
I had thought about 'expanding' it, as if it had grown, as the station today lends itself to a single track, and then looking at http://www.pottostation.co.uk it was huge any way.
The yard crane featured on the photos on the site, is still there in Prestons Yard today.
I just need to find the source of a plan of the station/yard.
I have sourced one with the council, which seams to be in Northallerton, which is difficult for me to get durning opening times!
Looks like a very interesting project, with lots of character but unfortunately I can't help you with plans. Perhaps you should contact the relevant railway society?