text: Thanks - I suspect it connects to https://www.openstreetmap.org/way/127554885 which I never quite got around to finishing about 8 years ago.  Normally with these I'd just record a couple of GPS traces and it it from that (and aerial imagery - where bits of it are visible too).  https://www.openstreetmap.org/way/127547643 has a "fixme" tag on it which you'll probably be able to see in a map editor.
  Best Regards,
  Andy