1. A Lot of Things Change-

One morning, you're hauling trucks and coaches across the island of Sodor, and the next, you're wandering on brand new feet across an abandoned island of Sodor, uncertain of how you got here, or if you're the only one...

The engines of Tidmouth Sheds and their friends wake and find themselves as... something else, and on a Sodor that has left them behind. The mysteries pile up as they find clues suggesting the human inhabitants left in a hurry...but why?

Boulder meanwhile, finds himself looking after the new mosaics under his care, and wonders if their arrival has anything to do with his family members' disappearance...