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Henry's Forest is a forest on the Main Line, located between Crovan's Gate and Vicarstown. It is nicknamed after Henry, 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. Sir Topham Hatt purchased replacement trees from a plant nursery, and now the forest is much greener and livelier than ever before.
- Series 3 - Gordon and the Famous Visitor, Henry's Forest, The Trouble with Mud and No Joke for James
- Series 5 - James and the Trouble with Trees (mentioned)
- Series 8 - Henry and the Wishing Tree
- Series 9 - Thomas and the Birthday Picnic, Henry and the Flagpole and Flour Power
- Series 10 - Thomas and the Shooting Star
- Series 12 - Henry 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.