Trains

Sam Sparky, Arnold, Ethan, George and Anthony were playing hide and seek and find an underground city, which is not on any map. They go inside and begin to explore it. Frightened they look around, see the broken pipes, crumbling walls, the ruins. Hoping to find the treasure, they find a closed box on the rails, in which there are drawings and things of vintage steam locomotives. After studying them, George has an idea, they turn the remains of the ruined city into Museum of Old Train Town.