I have been exploring Wordless Picturebooks for my upcoming column in The Reading Teacher (IRA). Locomotive is one of my favorites so far. The detailed information and settings explored in this wordless book are rich in American History. Learning about the history of trains in America through the stunning visually rendered narrative would entice boy and girl readers alike.
Brian Floca's website contains lots of great information for further exploring this picturebook and his other works (especially Moonshot).