Trains World' is a place only inhabited by trains. Among the residents, there are special trains that can transform into robots, the Robot Trains! One day, all the tunnels got blocked and the Train World is confronted a problem that needs to be solved. Since then, things that have never happened before start to pop up. The fastest train Kay, who is capable of passing through the blocked tunnels, holds the key to save the Train World. Let's rail around the Train World with Kay and friends!