Thomas & Friends - Season 5 - Eps 21: A Surprise For Percy
Percy is pulling some trucks up a hill when the coupling between him and the first truck breaks. This causes the trucks to break away and roll down the line, and at a tremendous pace at that! Will Percy catch them in time before they cause even more of a disaster?
About Thomas & Friends

Title: Thomas & Friends
First Air Date: 1984-10-09
Last Air Date: 2021-01-20
Status: Ended
Rating: 6.6/10 (from 122 votes)
Language: EN
Seasons: 27
Total Episodes: 666
Network: ITV1 5 CITV Cartoon Network Nick Jr.
Genres: Animation, Kids
Production Companies: Nitrogen Studios Canada
Synopsis
Thomas & Friends is a British children's television series, which had its first broadcast on the ITV network on 4 September 1984. It is based on The Railway Series of books by the Reverend Wilbert Awdry and his son, Christopher Awdry. These books deal with the adventures of a group of anthropomorphised locomotives and road vehicles who live on the fictional Island of Sodor. The books were based on stories Wilbert told to entertain his son, Christopher during his recovery from measles. From Series one to four, many of the stories are based on events from Awdry's personal experience.