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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 greener and livelier than ever before.
- In the eighth season, 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.