This is not "The only wooden viaduct remaining on the British railway network" - see https://en.m.wikipedia.org/wiki/Barmouth_Bridge. Also, as described in the article, it no longer actually carries the railway.
This is not "The only wooden viaduct remaining on the British railway network" - see https://en.m.wikipedia.org/wiki/Barmouth_Bridge. Also, as described in the article, it no longer actually carries the railway.