It’s a Race Against Time for Fireman Sam™ & his team. Gareth is taking the Science class to see the Aurora Borealis but he trips, accidentally releases the brake and falls off the train. As a cabin fire also breaks out, Gareth watches in horror as the train speeds off without a driver! The fire crew is called but their path is blocked by snow. Sam leaps from the helicopter to ski towards the runaway train to stop it before it reaches the end of the line!