OS map showing the Ffestiniog Railway about 1953, at a scale of 1:25,000. The map shows the railway after the construction of the Llyn Ystradau reservoir flooded a section of the track bed, but before the deviation was built to carry the railway around the western shore of the reservoir. The map is a composite of sheets SH 63, SH 64, SH 74 (1953) and SH 53 (1956)
Director General of the Ordnance Survey, UK
Composite of OS1:25000 maps SH 53, SH 63, SH 64 and SH 74