'Oh, Little Blue Engine,' cried the dolls and toys. 'Will you pull us over the mountain? Our engine has broken down and the boys and girls on the other side won't have any toys to play with or good food to eat, unless you help us. Please, please, let us, Little Blue Engine.' 'I'm not very big,' said the Little Blue Engine. 'They use me only for switching trains in the yard. I have never been over the mountains.' ... Puff, puff, chug, chug, went the Little Blue Engine. 'I think I can--I think I can--I think can--I think can--I think I can--I think can--I think can--I think I can--I think can--I think can.'