A pleasant walk, but as others have commented the roue along the road from #11 is unpleasant and very busy with traffic. Better to turn left at this junction and find a path a few metres along the road on the right hand side and walk up the path through the woods,( when I walked this in early 2018 there was a green way mark) at the top you will rejoin the disused railway track you started on and turn right to return to the parking.
