The Petropolis Monotrail is a new railroad transport system in Petropolis that was only seen in Forget Me Mutt. It was destroyed once by Verminious Snaptrap, but was rebuilt.
- The monotrail is a parody of a monorail.
- The monotrail resembles a habitrail, while it's name is also a combination of monorail and habitrail.
- The top of the monotrail looks exactly like Kitty's head.
- The monotrail is seen in the background in numerous episodes.
The railroad transport system