She was built in 1877 by Neptune Clive Adam and was the first engine on the Neptune Planetarian Railway. She did well, and was renumbered 39. She was sent to Sodor in 1904, but landed in the scrap. She survived years until 1931 when Edward saved her.
Saturn is based off a LB&SCR B4.
Saturn is bright yellow with purple lining, her wheels are black, she silver hand reils and a lamp at the front. Her tender carries the number 39 in red with purple outling.
After either the seventh season the show will be bumped up to the year 1977. To celebrate 100 years since Saturn was built. The movie will be about her parts getting worn and hoe she'll celebrate her 100th Birthday.