The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Buildings (22 members)
- Candidates for deletion (1 member)
- Candidates for speedy deletion (0 members)
- Citation needed (0 members)
- Cleanup (0 members)
- Commodities (25 members)
- Commodity images (35 members)
- Community (5 members)
- Copyright templates (12 members)
- Disambiguations (0 members)
- Documentation templates (3 members)
- Formatting templates (21 members)
- Front page sections (4 members)
- Guides (2 members)
- Hidden categories (0 members)
- Images (76 members)
- Images needing improvement (0 members)
- Infobox templates (4 members)
- Legal notices (3 members)
- Link templates (1 member)
- Locomotive images (10 members)
- Locomotives (11 members)
- Maps (1 member)
- Media (2 members)
- Missions (1 member)
- Navigation templates (3 members)
- Notice templates (15 members)
- Pages to be merged (0 members)
- Pages to be moved (0 members)
- Pages with broken file links (0 members)
- Pages with script errors (2 members)
- Railroad Corporation (16 members)
- Railroad Corporation Wiki (9 members)
- Stubs (7 members)
- Template documentation (47 members)
- Templates (16 members)
- Templates with bad documentation (0 members)
- Templates with no documentation (0 members)
- Unattributed files (0 members)
- User groups (18 members)
- Videos (0 members)
- Wiki maintenance (14 members)
- Wiki skin images (3 members)