This is another book I picked up off the shelf at the library based on the appealing illustration on the cover. I like the child-like quality of the paintings, the bold colors, and the fact that the book has a long horizontal layout so that each train can "go" across two pages. It was fun to read, too. My toddler liked all of the train noises. I think it will be even more fun when he's old enough to participate in the noise-making.
Updated August 2014: We checked this out of the library again, this time by my son's choosing. He's now 2 and, as predicted, he really enjoyed mimicking all of the train noises. One funny thing, though: because most of the trains aren't illustrated with their wheels directly on the tracks, he thinks that all of them are flying trains. Oh well!