One prominent historical operation of Welsh slate mining, situated near Denbighshire, saw small-scale extraction from the 17th century before commercial production commenced in 1857, fueled by the formation of the Cambrian Slate Company Ltd. This quarry's output significantly increased after 1873 with the opening of the Glyn Valley Tramway, a narrow-gauge line that facilitated the transport of slate to market, initially by horse and gravity. The tramway, also carrying passengers from 1875, later