As the little black train goes from station to station, Driver Zach picks up more and more silly passengers. Everything's fine when the cares are just full of talking yaks and singing acrobats, but adding two packs of elephants( not to mention the ducks dancing in the aisles) is enough to create pure mayhem. " The once-noisy passengers sitting with meek, serious expressions are just as amusing as the illustrations of chaos." --Horn Book.