Wilfred is a mountain engine on the Culdee Fell Railway. Like most of the other mountain engines, he has his own coach used for passenger services.
Wilfred was built at the Swiss Locomotive and Machine Works in Winterthur, Switzerland, in 1900. Soon afterwards, he arrived on Sodor during the opening of the Culdee Fell Railway.
When Culdee returned from an overhaul, Wilfred and Ernest informed him about changes that happened to the railway. Later, Wilfred and his coach were later delayed at the Summit after Lord Harry derailed at the points. Culdee and Wilfred teased him for being a "wreck".
According to Sodor: Reading Between the Lines, he and Ernest were superseded by the more modern Nos. 6-8 in 1964.
Wilfred is based on Wyddfa of the Snowdon Mountain Railway.
Wilfred is painted purple with orange lining.