|Donald and Douglas|
|Occupation: Mixed-traffic engines|
|First Appearance: The Twin Engines|
|Performer: Joe Mills (UK/US; both Donald and Douglas)|
Donald and Douglas are twin Scottish mixed-traffic engines.
Donald is one of the Scottish Twins and loves to play practical jokes on the other engines when given the chance.
Douglas is Donald's twin brother who came to the Island from Scotland after Sir Topham Hatt needed another good train.