So, presumably, Woodhorn would be the proposed terminus unless the track is re-laid and the line extended to Newbiggin.

A station at Cowpen might prove to be popular, however would it be at the expense of a station at Newsham?

After all, Newsham has always been proposed as a station which would also serve as Blyth's primary rail link unless, as with Newbiggin, the line into Blyth is reinstated. Presumably, Newsham would also be a P&R style station, and while I'm not knocking the idea of a station at Cowpen, is it viable for Blyth to have two P&R stations?