The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.

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• Paul Bushnell Model Railway‏‎ (0 members)
• Paul Charland‏‎ (2 members)
• Paul Charland Collection‏‎ (17 members)
• Paul Charland Photo‏‎ (12 members)
• Paul Enenbach‏‎ (1 member)
• Paul Enenbach Photo‏‎ (7 members)
• Paul Yates Photo‏‎ (3 members)
• People‏‎ (76 members)
• Percy Trefry Photo‏‎ (3 members)
• Peter Sayers Photo‏‎ (21 members)
• Peter Verkley Photo‏‎ (3 members)
• Phil Mason Photo‏‎ (4 members)
• Phil Vogler Collection‏‎ (44 members)
• Philip Mason Photograph‏‎ (5 members)
• Photo Car‏‎ (6 members)
• Photographer‏‎ (94 members)
• PhotographerUnknown‏‎ (1 member)
• Photographer Unknown‏‎ (2 members)
• Pile Drivers‏‎ (3 members)
• Port Williams‏‎ (1 member)
• Portland Works‏‎ (14 members)
• Postal‏‎ (7 members)
• Postcards‏‎ (151 members)
• Preserved DAR Equipment‏‎ (12 members)
• Private Locomotives‏‎ (3 members)
• Publication‏‎ (53 members)
• Publisher‏‎ (3 members)
• Pullman‏‎ (5 members)
• RDC‏‎ (29 members)
• RDC9058 Collection‏‎ (24 members)
• RS18u‏‎ (4 members)
• Radio‏‎ (0 members)
• Rail transport infobox templates‏‎ (0 members)
• Rail transport templates‏‎ (1 member)
• Railway Signals‏‎ (0 members)
• Railyards‏‎ (12 members)
• Randall House - Wolfville Historical Society Collection‏‎ (2 members)
• Randy Rockwell Collection‏‎ (5 members)
• Reastwood2home.com Collection‏‎ (1 member)
• Redirects from other template‏‎ (1 member)
• Refrigerator Cars‏‎ (2 members)
• Reports and Studies‏‎ (5 members)
• Research Help‏‎ (0 members)
• Rhode Island Locomotive Works‏‎ (1 member)
• Rhodes, Curry & Co.‏‎ (13 members)
• Ric Hamilton‏‎ (0 members)
• Ric Nelson Collection‏‎ (13 members)
• Richard M. Skelton‏‎ (3 members)
• Richard Manicom Photo‏‎ (18 members)
• Robert Greenwood Collection‏‎ (60 members)

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