We were a bit slow to warm up to this book. But the heavy machinery, action words (diggers are good at dig, dig, digging...) and colorful illustrations won us over. Each page features one heavy machinery worker and ends with "They can work all day." I like it that the last page is about "They can rest all night". As fun as the action is, my little guy also needs to learn how to get to "brakes on, engines off". We've had this a couple of months (the longest our library will allow, so I'm adding it to our wishlist.