A train full of food and toys for children suffers from a broken engine. After begging several other engines for help and being rejected, a little blue engine volunteers to take the train over the mountain.
"Oh, you can’t help that," said the Cat: "we’re all mad here. I’m mad. You’re mad." "How do you know I’m mad?" said Alice. "You must be," said the Cat, "or you wouldn’t have come here.”