As the little black train goes from station to station, Driver Zach picks up more and me silly passengers. Everything's fine when the cars 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. But Driver Zach is a very patient man--until a pair of pesky little mice climbs on board and then everything really goes haywire. Full color.