Thomas & Friends: The Missing Coach (Cancelled Episode)

"The Missing Coach" was intended to be a season 2 episode of Thomas the Tank Engine, involving twins Donald and Douglas swapping tenders in order to fool the Fat Controller. Halfway through filming, it was decided that the plot would be too complex for children to understand, so the episode was scrapped and replaced with "Thomas, Percy and the Coal".

David Mitton (writer/producer/director of the show) mentioned in a 2008 interview (shortly before his death) that he still possessed all the original footage filmed for the episode; although, where the masters are today is entirely unknown. 5 seperate screenshots that have appeared in various books/merchandise over the years are the only publicly available content from the episode.