Featured on Whats Hot in Kids games! A nursery rhyme for generations, Working on The Railroad is an interactive kids game that takes place through tunnels over rivers, across valleys and into the mountains. This sing a long is a fun and addictive app that sings its way across scenes that you can push and interact with. If you are looking for the perfect music app for your child this is it! Working on the Railroad is one of the only apps to play, learn and sing with!