From Festipedia, hosted by the FR Heritage Group
This contents takes you to Wikipedia pages about slate quarries that were not connected to the Ffestiniog Railway or the Welsh Highland Railway but are of interest because of their internal or external narrow gauge railway systems.
Dinorwic: [[1]]
Dorothea: [[2]]
Pen-yr-Orsedd: [[3]]
Penrhyn: [[4]]
