Simple little book about colours for very early readers. There's no real plot or anything, but what saves this from dullness are the illustrations, which are really well done. Each different type of train car is a different colour, and as the train moves faster and faster through the different tracks, the colours blur together to form an almost-rainbow (in rainbow order, except the last colour is black instead of violet). So it gets an extra point for that, because when the text is this unembellished there needs to be something about the art to compensate.