Donald9anddouglas10 is an user and the creative consultant who assists the series in the third season.
When it was announced that Logan would not be appearing in Enterprising Engines!, donald9douglas10 offered to give his extra Logan model to him. He accepted it, and Logan was added to the cast of Enterprising Engines. In addition, he co-wrote Logan's introductory episode alongside Matt as a thanks. He also voiced Fred the coal car in Logan's introductory episode.