This closed light railway extended the Ilen Valley Railway west from Skibbereen to Schull. It was of a different gauge to the Irish standard gauge Ilen Valley line, being a 4ft gauge line.
The formal name for the company for which the railway was built, in anticipation of building more lines, was the West Carbery Tramways and Light Railways Ltd. Other lines were not built.
This line is divided into a number of portions.