In the tale, a long train must be pulled over a high mountain. Various larger engines, treated anthropomorphically, are asked to pull the train; for various reasons they refuse. The request is sent to a small engine, who agrees to try. The engine succeeds in pulling the train over the mountain while repeating its motto: "I-think-I-can". The story of the little engine has been told and retold many times. The underlying theme however is the same - a stranded train is unable to find an engine willing to take it on over difficult terrain to its destination. Only the little blue engine is willing to try, and while repeating the mantra "I think I can, I think I can" overcomes a seemingly impossible task.
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