Cancelled 2015 Special

Before development began on Sodor's Legend of the Lost Treasure, a different special entirely was planned for 2015. The idea was not greenlit by Mattel, and thus it was cancelled and subsequently replaced.

Characters
The rest of the Steam Team and Sir Topham Hatt were also likely to appear.
 * Thomas

Characters introduced
One or more previously Railway Series-exclusive characters were also intended to appear. These were replaced by Rex, Mike and Bert in Sodor's Legend of the Lost Treasure.
 * Three tram engines

Locations

 * Vicarstown
 * Vicarstown Tramway