Will await its arrival before commenting further.
My new purchase arrived. A5 format, 35 pages, 'The railways of Weardale' (Rounthwaite/RCTS/1965). Not had a chance to read in detail as yet, but first half text, split in to a general background, followed by a couple of specific locations, albeit not all locations on the line from B-Auckland. The rear half is given over to images, four per page side, and finally three page sides of diagrams, the first a general basic schematic of all the lines in the area, followed by a couple of more detailed (track) plans, but these latter revolve around the quarries/industry along the route, not the NE/BR route as such.
Don't get me wrong, it's a nice work to have, but still lacking in (track/signalling) diagrams for the main stations along the Bishop Auckland-Wearhead line, hence my mentioning Middleton and Oakwood, who have published works with a little more detail. It may well be the case of course that no source material has survived to permit any authors to go there so to speak!