The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
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- 1990s television episodes (26 members)
- 2000s television episodes (4 members)
- A Wonderful American Journey with Thomas and Connie (1 member)
- Advisory templates (2 members)
- Alliances (8 members)
- Animals (4 members)
- Appearance templates (1 member)
- Article management templates (2 members)
- Article stubs (0 members)
- Attractions (1 member)
- Authors (2 members)
- Awdry-created charatcers (1 member)
- Awdry Family (2 members)
- Background Templates (1 member)
- Big World! Big Adventures! (1 member)
- Blog posts (0 members)
- Blue Mountain Mystery (1 member)
- Books (11 members)
- Browse (7 members)
- Buzz Books (9 members)
- Calling All Engines! (1 member)
- Cancelled episodes (2 members)
- Candidates for deletion (16 members)
- Character's other content (23 members)
- Character templates (35 members)
- Characters (48 members)
- Christmas episodes (2 members)
- Classic Series (70 members)
- Color templates (1 member)
- Community (4 members)
- Conflicts (2 members)
- Contestants (26 members)
- Credits (83 members)
- Day of the Diesels (1 member)
- Deceased Cast and Crew Members (2 members)
- Diesel's Ghostly Christmas (1 member)
- Directors (2 members)
- Disambiguation pages (6 members)
- Disambiguations (0 members)
- Eating challenge episodes (1 member)
- Elimination tables (1 member)
- Engines (1 member)
- English Voice Cast (1 member)
- Epiaodes focusing on Gwen (3 members)
- Episode and season templates (2 members)
- Episode navbox templates (3 members)
- Episodes (137 members)
- Episodes and sesaons templates (1 member)
- Episodes fcousing on Courtney (1 member)