Wintertime in Equestria, and Hornette is looking forward to her first Hearth's Warming. She keenly soaks up the spirit of the season as she buys presents and helps prepare for the big day - only to break her present to Locomotion by accident.

Locomotion is excited too, as he has been chosen to work a seasonal special train between Ponyville and Fort Maine. On the return journey, however, bad weather threatens to cut him and his passengers off, and now it's up to his uncle and marefriend to rescue him...