Air date: November 7th, 2005 (UK), November 6th, 2005 (US)
Duncan is looking forward to taking holidaymakers to see the Culdee Caves when his job is given to Bertie instead. The Thin Controller wants him to deliver coal trucks to the Transfer Yards with Rusty as the machines at the Coaling Plant have broken down. However, while on his way to the coal mine, Duncan sees an old line leading towards some bushes. Ignoring Rusty's reminder that they have work to do, Duncan goes down the old line which leads to an old mine entrance. Carelessly, Duncan crashes into a roof support, causing the entrance to collapse behind him.
As Duncan has not arrived yet, Rusty attempts to look for him. Meanwhile, Duncan carries on into the mine until he hits something. At first, he thinks they are buffers, but he hears a squeaking noise and realises that he has run into some coal trucks.
Pushing the trucks, Duncan finds that the mine shaft is actually a mine tunnel when he arrives at a bordered-up exit. He then pushes the trucks out of the mine and is found by Rusty at the exit with the trucks. The two take them down to the Transfer Yards where Thomas and the Thin Controller are waiting. Duncan tells the Thin Controller about his adventure, who tells Duncan that he was very lucky and that he must think clearly when he wants to have another adventure.
This episode contains examples of:
- All Work vs. All Play: Rusty and Duncan respectively. Rusty reminds Duncan of their work, but Duncan wants to go on an adventure.
- Alliterative Name: Duncan wants to take the holidaymakers to the Culdee Caves.
- She's a Man in Japan: Rusty was incorrectly referred to as a female in the original airing of the American dub. This was fixed for the DVD release.
