"Chug, chug, chug. Puff, puff, puff. Ding-dong, ding-dong."
The beloved tale of the little blue engine — who helps bring a broken-down train of toys to the good little boys and girls on the other side of the mountain — has been chugging along for a very long time. But despite the locomotive's optimistic refrain — I think I can, I think I can, I think I can — the story has a somewhat checkered past: In its tracks, The Little Engine has left both a legal battle and a debate over whether the little blue engine is male or female.