Jennings was a narrow gauge well tank engine who used to work on the Mid Sodor Railway. He was not featured in any stories, but was featured on the Rev. W. Awdry's layout of the railway. It is unknown what happened to him after the Mid Sodor Railway closed.
Jennings was built out of a Peco James kit and was modified into an 0-4-0 Well Tank engine.
Jennings resembles the Talyllyn Railway's Dolgoch, Rheneas' basis. It is possible that Jennings might be named after the works Fletcher, Jennings & Co., which was were Skarloey, Rheneas and Captain Baxter built.
Jennings is painted red with a brass dome. His footplate is painted black, while his bufferbeam is painted red.