Computer animated holiday film “The Polar Express” follows a group of children who board the titular train as it travels towards the North Pole. The fantastical trip was co-written and directed by Robert Zemeckis, who also guided audiences through the beloved adventures found in “Forrest Gump” and the “Back to the Future” trilogy. Since its release, sentiment for “The Polar Express” has done more than place it among Zemeckis’ greatest stories—it elevated the film to a modern holiday classic.