nicknamed after Yogi, who frequently visits the forest. Once, a storm tore down roughly half the trees, leaving much of the underlying hills bare. This created a bleak landscape, depressing engines and people alike. Stoick the Vast purchased replacement trees from a plant nursery, and now the forest is much greener and livelier than ever before.
- Series 3 - Yogi Herny and Forest and No Joke for Matoi
- Series 8 - Yogi and the Wishing Tree
- Series 9 - Ryouma and the Birthday Picnic, Yogi and the Flagpole and Flour Power
- Series 10 - Ryouma and the Shooting Star
- Series 12 - Yogi Gets it Wrong
- In the eighth series, many of the trees between the railway lines were removed, and only three lines ran through the forest. Fences were also placed beside the railway line.