Mountain Engine is an upcoming episode from the twenty-third series.


Donald arrives with Culdee, an mountain engine who tells Millie and Glynn about his line, and an adventure he had on his first day when he learned how to use his automatic brakes during a thrilling journey down a mountain.


Douglas, Stephen, the Skarloey Railway Engines, the Culdee Fell Engines and Mr. Percival are likely to appear.

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