It’s a sentimental, somewhat romantic celebration of trains.  The illustrations are soft and a bit unfocused, to give it a nostalgic air, and the text is a poetic description of different kinds of trains doing different kinds of jobs.  The words play with language, giving it a rhythm reminiscent of the the chugging trains, and yet including a lot of vocabulary specific to the world of trains.  An illustrated glossary in the back provides illumination for unfamiliar terms.