The quarry at Penmaenmawr on the North Wales coast had an extensive 3ft gauge system. A number of locomotives built by De Winton of Caernarfon were used on the railway from the 1870s, as the production of granite setts for Victorian towns increased.
The company later purchased locomotives built by the Hunslet Engine Co. of Leeds, and the works plate from No.771 of 1902 is shown. This locomotive was scrapped in 1951.