Olivia Williams has promised Joe Wright's new film adaptation of Tolstoy's Anna Karenina will be "stunning".
The Ghost Writer actress is among an all-star cast including Keira Knightley, Aaron Johnson, Jude Law and Kelly Macdonald in the Atonement director's new interpretation of the tragic love story.
Olivia said: "It's like a dream, standing on a train station covered in snow with a steam train arriving and you can't really believe that it's your job.
"It's fantastic, it's going to be the most stunning film."
The Sixth Sense star was speaking at the London Evening Standard Theatre Awards, where she was presenting, after appearing on the West End stage earlier this year in Neil LaBute 's In A Forest, Dark And Deep.
Asked why so many big screen stars return to the stage, Olivia said: "For me it's like a petrol station.
"You need to fill up the tank with what theatre gives you, because film tends to just take, where as theatre is as much an increase in your experience rather than just a sort of sapping of your energy."