Disused Railway Tunnels UK stated: "The line appeared to be double-track for most of its length, but it was in fact two parallel single-track railways between Caernarfon station to a point just north of the River Seiont, at that point the lines separated, one continued south crossing the river on a stone viaduct to link to the Afon Wen line and the other turned east to connect to the Llanberis branch.".
All were operated by London and North Western Railway - one served the Afon Wen line down the Llyn Peninsula, another managed trains on the Menai Bridge Line, while the third was the terminus for the Llanberis line.
'Lost' tunnel that lay beneath seaside town derelict for 30 years A photo shows a railway tunnel running under a UK seaside resort that had become overgrown with vegetation after it was abandoned for 30 years.
The Llanberis line was reportedly lifted from February 1965 leaving only the single track of the former Afon Wen line in situ.
They noted that the lines between Caernarfon and Afon Wen, as well as the Llanberis branch line, both ceased operations for all trains in 1964.
