Transportation
From the mid 1850s 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. In the 20th Century the railway's use was discontinued, instead the slate carriages were pulled by a tractor. The railway has now been removed.
Read more about this topic: Aberllefenni Slate Quarry