It's a cold, snowy day in Chuggington and every available chugger is heading out to plough, except for Chatsworth, who is going for a rest after ploughing all night, and Hoot and Toot, who are too inexperienced to be out in the snow. Koko and Harrison head off as a team, Harrison boasting there isn't a drift that can stop him! He blasts through drift after drift and when they come across the biggest drift of all, Harrison tackles it head on and gets stuck inside it!
Koko assembles an enormous conga line of chuggers to get him out but they can't quite manage it until, at the last minute, Hoot and Toot and Chatsworth come to the rescue, coupling onto the back of the line, giving the extra strength needed to pull an embarrassed Harrison free.
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