The original route, with the terminus pretty much where the Morrisons is now (where the old station was).
That route would be part of the Metro instead, with the tracks shared as NR/Metro south of the Plessey LC area.
Not sure that would be viable now as it would involve demolishing the sport centre and hospital which I can't see going too well. I know there was talk of it going towards Cowpen at one point but they've built houses on there aswell. Seems to be a trend in Blyth as they built houses on the new road into Blyth aswell.