12m 20 1/2 c
 Viewed from the South side with the Afon Prysor making its way down to the valley. Built by the line’s contractors Meakin & Dean at a cost of £8,228,15s 6d it stands at 1200 feet above sea level, 720 feet above Bala Junction and 655 feet above Festinog |  |  Viewed from the West on 11th August 2022 the viaduct is slowly being obscured by trees. The formation seen in the above photograph between the rear coach and the abutment has been removed and the footpath at this location now drops some 15 feet before regaining track bed height. On the opposite side of the viaduct the line enters a series of deep cuttings in the rock located to the fore of the conifers in the distance |
 A scene often witnessed on the line, 5774 with a mixed train of two coaches and two vans coasts down grade over the viaduct heading for Trawsfynydd |  Just a few weeks from closure in January 1961 and heavy double-headed freights could still be seen on the line. Here 9752 pilots 9793 over Cwm Prysor viaduct with a Blaenau Ffestiniog bound train. Snow covered hills witness four vans, three cement wagons, three vans, two more cement wagons, a flat wagon, an open wagon, a bolster, two bogie minerals carrying possibly household coal and the brake van, and yet the line was due to be lost forever just a few weeks from this photograph being taken |  Viewed from the rear verandah of the BR brake van, the 11:30am Blaenau Ffestiniog to Bala goods, headed by 9793 heads onto the viaduct. The wagons are headed by four vans, a bogie bolster and an open mineral |
 A short freight of two vans and two cement wagons heading back to Bala in 1960 |  |  4617 heading a Bala bound freight. Note the check rail fitted to the line due to the curvature of the viaduct |
 The head of the Prysor Valley viewed from the viaduct with the Afon Prysor flowing downstream on 11th August 2022. The line passes in front of the Forestry Commision conifers to the left to reach Cwm Prysor Halt. Arenig Fawr can be seen dominating the skyline |  The view down to the Afon Prysor 150 feet below |  |
 In 1953 British Railways undertook work on the viaduct to replace the stone parapet walls with concrete and railings. Here the North wall has been reduced in height and the first concrete section with its posts has been cast. The planking down the 4 foot was to help with moving materials to where they were need, probably by means of wheelbarrows |  |