 The summit of the line was at which lay at above sea level.The line served an extremely remote area of North Wales, most of which was not served by a main road until the A4212 road opened in the early 1960s.In 1964, a connection was made through Blaenau to the Conwy Valley Line at allowing access as far as Trawsfynydd nuclear power station; a loading facility for nuclear flasks was constructed on a siding a hundred yards north of the closed .