 Canadian Pacific SIG
 - Dedicated to sharing information about the Canadian Pacific Railway and its subsidiaries, past and present.- Canadian Railroad Historical Association (CRHA)
- Seeks to preserve and disseminate information and the acquisition of artifacts and archival material concerning railway heritage in Canada.
- Akron Canton & Youngstown Railroad Historical Society
- Dedicated to research and preservation of AC&Y Railroad history.
- Amtrak Historical Society
- Venue of education and research on the preservation of the history of Amtrak. Includes information about long term projects and previous conferences, as well as documents like early press releases from Amtrak's founding.
- Australian Railway Historical Society@
- Baltimore & Ohio Railroad Historical Society
- Central of Georgia Railway Historical Society
- Dedicated to the history of the line, its predecessors and successors, and the collection, preservation, and interpretation of the history of the railroad.
- Chesapeake and Ohio Historical Society
- Devoted to the history of the Chesapeake and Ohio Railway.
- Chicago & North Western Historical Society
- NMRA SIG maintained site includes photos, information, and history of the C&NW and merged lines.
- Class 40 Preservation Society
- U.K. Railway preservation group, owners of ex-British Rail mainline EE Type 4 locos D335 and D345. Website Also incorporates East Lancashire Railway (ELR) diesel info page.
- Darjeeling Himalayan Railway Society
- Promotes awareness of, interest in, and support for the railway.
- Denver Rail Heritage Society
- Come visit and ride an open trolley car along the scenic Platte Valley.
- Electric Railway Historical Association
- History of the electric street railways and the horse and cable car systems of Southern California.
- Friends of the Cumbres & Toltec Scenic Railroad, Inc.
- Nonprofit group sharing the stewardship of the historic railroad property.
- Friends of the East Broad Top
- Educational and historical society dedicated to the preservation and restoration of the East Broad Top Railroad National Historic Landmark in Huntingdon County, PA.
- Georgia Southern & Florida Railroad Historical Society
- Includes system maps, depot and locomotive photographs, and profiles of the GS&F RR and others on the Suwanee River Route, including the Atlantic, Valdosta & Western Railway and the Macon & Birmingham Railway.
- Great Northern Railway Historical Society
- NMRA SIG maintained site includes modelling information, reference sheets, photos, and information about the GN.
- Illinois Central Railroad Historical Society
- Dedicated to the preservation of the Illinois Central System.
- International Society for the Preservation of Women in Railroading (ISPWR)
- Revives the role of forgotten workers in the history of the railroad.
- Lachlan Valley Railway Society
- Restores, maintains, and operates vintage trains. Includes locomotive depot and museum.
- Maryland and Pennsylvania Railroad Preservation Society
- Aims to preserve the heritage of the renowned and historic "Ma & Pa Railroad".
- Merchant Navy Locomotive Preservation Society
- Formed in 1965 with the dual aims of saving one of the unique Merchant Navy Class locomotives for posterity and maintaining it in running order.
- Mid-Continent Railway Historical Society
- Nonprofit educational organization dedicated to steam locomotive preservation, is a memorable travel experience for passengers of all ages.
- Midwest Railway Historical Foundation
- Dedicated to preserving the history of steam locomotive power. Includes pictures of The 4070 and others.
- Milwaukee Electric Railway & Transit Historical Society
- Site dedicated to the preservation of traction history.
- National Railway Historical Society (NRHS) (11)
- Northampton & Lamport Railway
- Classic steam and heritage diesel operated railway set in the Northamptonshire countryside.
- South Bay Historical Railroad Society
- Activities include the restoration of the historic Santa Clara Depot and Tower complex, railroad museum, and club-sized HO & N-scale layouts.
- Southern Railway Historical Association
- Dedicated to the preservation of the history of the Southern Railway.
- Southern Railway History and Modeling
- Featuring history, photo galleries, and information on railroad equipment and modelling.
- United Railroad Historical Society of New Jersey
- Equipment listings, news, and more.
- Welsh Highland Railway
- A 2-foot gauge steam railway through the Cambrian Mountains.
- Western New York Railway Historical Society
- Nonprofit organization dedicated to preserving Western New York's railroad heritage through restoration projects and other events.
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