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

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• Robert R. Brown Collection‏‎ (27 members)
• Robert Taylor‏‎ (1 member)
• Robert Taylor Photo‏‎ (1 member)
• Roger Eisner Estate Collection‏‎ (46 members)
• Roger Puta‏‎ (1 member)
• Roger Puta Photo‏‎ (7 members)
• Roger Robinson Photo‏‎ (8 members)
• Rogers‏‎ (2 members)
• Rolling Stock Parts & Appliances‏‎ (4 members)
• Ron Haight‏‎ (2 members)
• Ron Haight Collection‏‎ (16 members)
• Ron Haight Photo‏‎ (163 members)
• Ross Gray Collection‏‎ (6 members)
• Roundhouses‏‎ (9 members)
• Royal Trains‏‎ (1 member)
• Rules and Regulations‏‎ (8 members)
• S-3‏‎ (3 members)
• S.K. Bolton Jr. Photo‏‎ (3 members)
• SPITFIREMK14 Collection‏‎ (2 members)
• SPOORWEGER Collection‏‎ (9 members)
• STEPHENS F.V.‏‎ (1 member)
• SW1200RS‏‎ (14 members)
• SW1200RSu‏‎ (9 members)
• Samuel M. Clark‏‎ (7 members)
• Samuel M. Clark Collection‏‎ (77 members)
• Samuel M. Clark Model Railway‏‎ (0 members)
• Samuel M. Clark Photo‏‎ (34 members)
• Sanding Towers‏‎ (1 member)
• Sarah Taylor‏‎ (1 member)
• Sarah Taylor Photo‏‎ (4 members)
• Saxon Locomotive Machine Works‏‎ (11 members)
• Scheduled Trains‏‎ (38 members)
• Schenectady Locomotive Works‏‎ (18 members)
• Scotian Railroad Society‏‎ (29 members)
• Sea Captain Caps‏‎ (0 members)
• Service Cars‏‎ (1 member)
• Sidney Payne Photo‏‎ (1 member)
• Silverware‏‎ (1 member)
• Sissiboo Pulp & Paper Co.‏‎ (0 members)
• Sleeper‏‎ (3 members)
• Snowplows‏‎ (9 members)
• Southam Newspapers‏‎ (1 member)
• Special and Excursion Trains‏‎ (4 members)
• Speeders‏‎ (0 members)
• Spreaders‏‎ (1 member)
• Spud Roscoe Collection‏‎ (1 member)
• Spur Track D Kingsport‏‎ (5 members)
• Stationery & Forms‏‎ (5 members)
• Stations‏‎ (68 members)
• Steam‏‎ (141 members)

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