Gwyneth Paltrow plays Helen Quilley, the main character in the film, whose life splits into two different paths based on whether she catches or misses a train.
John Hannah portrays James Hamilton, a man who plays a pivotal role in both of Helen's divergent storylines.
John Lynch appears as Gerry, a significant character in Helen's life whose actions affect her journey in the film.
Jeanne Tripplehorn takes on the role of Lydia, a character who interacts with Helen in both versions of her life story.
Zara Turner portrays Anna, a friend of Helen who offers support and companionship in the film's multiple narratives.
Douglas McFerran plays Russell, a character who provides perspective and insight into Helen's experiences and choices.
Paul Brightwell appears as Clive, a character who interacts with Helen and influences her storyline in the film.
Nina Young portrays Claudia, a character who plays a role in shaping Helen's destiny in the different versions of her life.
Virginia McKenna takes on the role of James's Mother, a character who adds depth to James's background and motivations.
Kevin McNally appears as Paul, a character who interacts with Helen in various ways throughout the film.
Theresa Kartell plays Rachael, a character who is part of Helen's social circle and influences her experiences in the movie.
Christopher Villiers appears as Steve, a character who has a role in shaping Helen's story in Sliding Doors.
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