Every library should have The Little Engine that Could.  It’s a classic tale with a timeless message that every child needs to have access to.  This particular edition is a board book and “an abridged edition.”  I’m not usually a fan of abridgements, but if it hadn’t declared itself so on the cover, I wouldn’t have noticed, as it did a good job of keeping all the pertinent meat of the original tale.  And though I don’t usually select board books for my shelves, I do recommend having a basket or two on hand for use with the special needs classes who come, so the kids can enjoy the books without destroying the general collection.