|This article is about the Chinese DVD. You may be looking for the episode or the magazine story.|
The Switch is a Chinese DVD featuring five episodes from the seventeenth season.
When Luke is sent to Ulfstead Castle to deliver stone he meets Millie, the Earl's private narrow gauge engine. The two engines compare jobs, boasting how much they like their own work and so the Earl agrees to let them switch jobs for the day. Luke stays at the estate pulling passengers around the castle grounds and Millie goes to work at the noisy Blue Mountain Quarry. By the end of the day both engines are firm friends, but agree they like their own jobs better.