SomeoneElse
There are duplicate viaducts here, possibly in error and a suggestion at https://www.openstreetmap.org/changeset/112428126 that https://www.openstreetmap.org/relation/61495 continues down the old railway.  Probably needs a survey to fix properly.  See https://map.atownsend.org.uk/maps/map/map.html#zoom=18&lat=51.785157&lon=-2.675311 for more clarity of what there is here.