Interlude at Llandudno Junction 4 The Freightliner has slowed to a stop at the signal which is set against it on the approach to Conway Castle bridge. Although the Britannia Bridge over the Menai Straits has always been famous for its method of conveying the railway in ‘tubes’, as can be seen, the Conway bridge was constructed on the same principle and is the only survivor as the former was destroyed by fire being rebuilt as a double-deck bridge, the railway sharing with the motorway standard A5 road which has also replaced the previous single-carriageway as seen here with a Ford Escort Mk2 and a Humber Sceptre amongst other 1970s vehicles.