Yoohoo! Yoohoo! A steamer's escaping! Yoohoo!—The Passing Diesel
The Passing Diesel is a Diesel who shouted a warning that Oliver (TV Series) was escaping. When Douglas was helping Oliver, Isabel and Toad_(Brake_Van) escape from scrap, he witnessed the event. Douglas told the stowaways to take no notice of the diesel. The Passing Diesel was not seen in any illustrations.