A little railroad engine works for a station yard pulling a few cars on and off the tracks. One morning a long train of freight-cars asked a large engine built for hard work to take it over the hill. When the great engine says it's too much work, the train asks other engines, only to hear excuses and be refused. When the train asks the little locomotive to do the job, it puffs "I think I can," and puts itself in front of the great heavy train. Will the little engine make it over the hill?