The Skarloey Railway Slate Quarry is a large quarry where all of the Skarloey Railway engines take duties. Engines such as Rusty. Other visitors to the Slate Quarry over the years have been included.

In The Railway Series, after the copper mines had run dry at Ward Fell, it was found that good slate was available in the foothills. During World War II the Ministry of Defense bought the mines and used it as an ammunition dump.