Thomas & Friends - Season 5 - Eps 25: Rusty & The Boulder
The Fat Controller has opened a new mine, and both the normal gauge and narrow gauge railways have tracks to it. An old boulder has had to be moved to make way for the mine, and Rusty is worried about it. Some time later the boulder is shaken loose and falls off the cliff it has been placed on and it chases Rusty down the line! Rusty manages to escape via a siding, but the boulder continues to thunder along! Back at the mine, Percy, with nowhere to run, sees the boulder up ahead, and it's heading straight for him...
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.