It has always made me wonder if that has been the potential all along to run the two loops, for all the talk of extension to the Metrocentre and running under the Tyne towards Benwell, with an infinite budget, even then would it be feaseable? The Leamside line was until a few years ago, untouched, I have wanted to walk it for years, but since the fences have gone up at the Wardley end, I have been apprehensive about doing so, is there still some infrastructure along the stretch to Washington?
In comparison to other schemes, the layout hasn't been built on in any major way so there should be no major deviation, from what I can see on Google Maps, the only part that should it be used for a Metro loop to South Hylton that would need some thinking about is the stretch from the viaduct to South Hylton.