Hero Boy: At one time most of my friends could hear the bell, but as years passed it fell silent for all of them. Even Sarah found one Christmas that she could no longer hear its sweet sound. And though I've grown old, the bell still rings for me, as it does for all who truly believe.
During the scene when the Polar Express slides across the ice and the conductor is telling the train controllers to head for the tracks, the distance between the train and the tracks keeps changing.
The voice of Hero Boy's mother and sister are done by director Robert Zemeckis' wife, Leslie.