High in the hills of Sodor, there is a narrow gauge railway that runs alongside a lake by the woods and a picturesque waterfall. The railway is run by four little engines named Skarloey, Rheneas, Sir ...

Passengers also used the service to reach remote villages high in the hills. Talyllyn Railway found its way into Awdry's books, first appearing as the Skarloey Railway in Four Little Engines in 1955.