Released in 2004, director Robert Zemeckis' adaptation of The Polar Express is a modern Christmas classic. Based on Chris Van Allsburg's 1985 children's book of the same name, The Polar Express a fantastic film with thrilling moments, highlighting the magic of a round-trip journey to the North Pole. In fact, it's so fantastical that even the characters involved question whether the Polar Express was a dream.
Source：https://www.cbr.com/polar-express-not-dream-explained/
