Thomas and the Special Letter is the twenty-second episode ever made in Season 4.
Thomas is surprised to see some of the engines traveling to Tidmouth Sheds and follows them to get to the bottom of the matter. It turns out the first eight engines have been invited to the big city by a little girl eager to meet the engines, and the others are to do their work. Thomas is paired with Oliver to show him his branch line. Thomas is feeling excited and boasts about his race with Bertie, unluckily crashing through the buffers and into a wall. The workmen race to repair Thomas in time for the trip, and manage to do so just in time.
- When Thomas says "I think something is up" a door can be heard closing.