In this book, when switchman Jack, eating lunch by his shack, spies an ant walking along the railroad track, he immediately gets worried - it's an eastbound ant on the westbound track, and that means a train could run smack into the little guy. He knows he has to do something to help. After all, they - just like the ant - are very small in a big world. And they'll really love the way the adorable little bug has the smarts to save itself!