Skarloey is a narrow guage engine.
Season 1 - Luke and the Special Party, The New Diesel Fuel (cameo), Rusty and Victor, and Sleepy Merrick
Season 2 - Yellow Rheneas, King of the Mountains, Paxton in Trouble (cameo), Duncan and Smudger, and Luke and the Cuban Repairs
Season 3 - Duncan's Donuts, Grumpy George, Sir Handel, Rusty and the Runaway Boulder, Rheneas and the Bridge, and Duke Returns (cameo)
Season 4 - Peter Sam's Delivery, Special Twins, Colin and the Party, Buster and George and Neil the New Engine (flashback cameo)
Season 5 - Skarloey, Rusty and the Snow, Blondin Bridge, Which Way?, Duncan and the Ghost Engine, Toby and Rheneas, Duke rescue to Sir Handel (cameo) and Hiding in the Hills