Such a service between Trawsfynydd and Blaenau Ffestiniog survived to the line's closure to passengers in 1960. Up to 1930 at the earliest such services used dedicated, lower standard, coaches which used a specific siding at Blaenau where the men boarded from and alighted to the ballast. Occasionally "double trains" ran, including at least one mixed double, composed of two locomotives, two coaches and several wagons. By the 1950s the line was deemed unremunerative. A survey undertaken in 1956 and 1957 found that the average daily numbers of passengers boarding and alighting were:   Military traffic had ended and, apart from a finite contract to bring cement to Blaenau in connection with the construction of Ffestiniog Power Station freight traffic was not heavy, most arriving and leaving Bala did so from and to the south and that to Blaenau could be handled from the Conwy Valley Line northwards. In 1957 Parliament authorised Liverpool Corporation to flood a section of the line by damming the Afon Tryweryn. Monies were made available to divert the route round the dam, but it was decided that improving the road from Bala to Llan Ffestiniog would be of greater benefit. Road transport alternatives were established for groups such as schoolchildren and workers. The plans afoot for rail serving Trawsfynydd nuclear power station were to be catered for by building the long-discussed cross-town link between the two Blaenau standard gauge stations. The estimated financial savings to be made were £23,300 by withdrawing the passenger service and £7000 in renewal charges. The station closed in January 1960 but freight services between Bala and Blaenau continued for a further year, the final train passing on 27 January 1961. The track though the station was lifted in the 1960s. In 1964 the line reopened from Blaenau southwards to a siding near the site of where a large ("Goliath") gantry was erected to load and unload traffic for the then new Trawsfynydd nuclear power station. The main goods transported were nuclear fuel rods carried in nuclear flasks. The new facility was over ten route miles north of Arenig, so the reopening brought no reprieve. Rail enthusiasts' special trains traversed the line from time to time, notably the "last train" from Bala to Blaenau Ffestiniog and return on 22 January 1961.