Atomic Kitten is an British pop group who helped with the music score in Thomas and the Magic Railroad. They also performed one song for the film.
Members include, Liz McClarnon, Natasha Hamilton and Kerry Katona as well as Jenny Frost, Heidi Range and Michelle Heaton. (The latter three were not apart of the group during production of Thomas and the Magic Railroad.)
- Liz McClarnon (1998-2004; 2012-present)
- Kerry Katona (1998-2001; 2012-present)
- Heidi Range (1998-1999)
- Natasha Hamilton (1999-2004; 2012-present)
- Jenny Frost (2001-2004)
- Michelle Heaton (2013-present; International tours only)