The Secrets of Mudslide Mountain

The Secrets of Mudslide Mountain is a cancelled 2013/2014 Thomas & Friends special. It was ultimately dropped and replaced with either King of the Railway or Tale of the Brave.

The only evidence of its existence comes from three promo pictures released around this time. It can be indicated from the promos that the plot would have had something to do with Thomas discovering something within old underground tunnels on Sodor. It is unknown where exactly on Sodor these tunnels were meant to be, but one of the promos with Thomas suggests it could be some kind of dual-gauge extension of Ulfstead Mine, as a drawbridge-like chain can be seen in the right-hand corner of the promo.

Characters
Other characters likely would have appeared as well.
 * Thomas
 * James
 * Percy

Trivia

 * There was as TrackMaster set called the Mudslide Mountain Set and it was released in 2014. While this is unconfirmed, it is likely that this set is based around the cancelled movie.

Merchandise

 * TrackMaster