Gauge: 1ft 11½in (600mm)
The Cambrian Railway which opened in the 1860s was not much used for slate traffic but nevertheless a number of small slate quarries were worked on the south side of the Mawddach estuary in the area of Fairbourne and Arthog. The amount of slate quarried did not make any elaborate form of transport worthwhile.
Friog Quarry utilised a lightweight (20lb/yd rails) 2 foot gauge tramway on site. Simple T sections rails were used but a length of Thomas Hughes type rail was also found there: this is of round section with a hook at each end for fixing into a hole in a cast iron joint chair.