Thomas the Tank Engine is the subject of a new documentary. An Unlikely Fandom: The Impact of Thomas the Tank Engine will premiere at this summer's The Greatest Gathering event in Derby, England.

Thomas the Tank Engine and his railway friends have innocently entertained generations of children. But now a psychologist claims that the make-believe adventures of the steam engines could leave ...

Thomas the Tank Engine and his friends are being threatened by diesel engines like the surly Diesel 10 and his sidekicks Splatter and Dodge.