Transportation From 1859 the quarries at Aberllefenni were connected to the Corris Railway, a narrow gauge railway which carried slate down the Dulas Valley to Machynlleth. There it was transferred to the standard gauge Cambrian Railways and shipped throughout Great Britain. The Aberllefenni quarries continued to dispatch slate on the Corris Railway until its closure in 1948. After 1948, the short tramway connecting the quarries to the slate cutting shed at Aberllefenni continued in use. Although locomotives were used underground, the tramway was operated by horse haulage. This continued until the early 1960s, when a tractor replaced the horses. The tramway was removed in the late 1970s, being replaced with lorries and forklift trucks. Underground, the gauge tramway continued in use, operated by battery electric locomotives until the end of working in 2003. References External links Corris Railway Slate mines in Gwynedd Industrial railways in Wales Corris Aberllefenni Railway inclines in Wales 2 ft 3 in gauge railways in Wales