Gator's Discovery is a Season 9 episode.
Gator is chuffing along Edward's Branch Line when he notices something moving on a hill. It appeared to be a miniature railway with three engines running it. Their names are Michael, Kaleb and Harry. They all have a good talk and they reveal that they have been working there for a decade. Gator then tells Percy and Duck about his discovery and now they deliver ballast and gravel to the small line.
- Charlie (does not speak)
- Brandon (cameo)
- Steve (cameo)
- Edward (cameo)
- This marks the first appearance of the Hill Top Mini Railway, abeit unnamed
- The Railway is based on the Indian Mountain Railway.