- International Union of Railways
 - Coordinating body for passenger and freight railways the world over, playing a vital role in rail infrastructure, research and development, and management. - National Association of Railroad Passengers
- Promotes passenger trains as a safe, comfortable, energy-efficient, environmentally sound form of travel.
 Railway Association of Canada
- Trade association for the railway industry in Canada.- Association of American Railroads - Transportation Technology Center
- TTC has 48 miles of railroad track for testing rolling stock, track components, and signal and safety devices.
- American Association of Private Railroad Car Owners
- Nonprofit body of current and potential passenger car owners.
- Rail Passengers Council (RPC)
- A body set up by the U.K. government to deal with passenger issues, including safety and security, punctuality, fares, cleanliness, facilities, and more.
- New Haven Railroad Historical & Technical Association, Inc.
- Nonprofit group to preserve the history of the New Haven Railroad and its predecessor lines.
- High Speed Rail/Maglev Association
- Organization working to expand high speed ground transportation service worldwide.
- Railway Enthusiasts Society
- Largest working rail museum in New Zealand.
- California Trolley and Railroad Corporation
- Nonprofit organization with a mission to restore, preserve and interpret railroad equipment used in the Santa Clara Valley.
- Massachusetts Bay Railroad Enthusiasts, Inc.
- Whether your interest in railroading centres on rail travel, photography, history, models or just a love of trains.
- International Air Rail Organization (IARO)
- Professional group whose member companies plan, develop, build, and operate rail links to airports.
- National Federation of Rail Socities
- Formed to provide co-ordination and leadership to over 50 heritage and tourist rail groups and organisations in New Zealand.
- National Association of Railway Business Women
- Professional women's organization stimulating interest in the railroad industry.
- Canada by Rail
- Offers information about tourist rail travel and rail-related attractions across Canada.
- Pacific Railroad Society
- Association of railroad devotees.
- Diamond Valley Railway
- Provides people the opportunity of building and operating a real passenger carrying railway system in miniature.
- Connecticut Rail Commuter Council
- Advocating better commuter rail service for riders of the Metro-North and Shore Line East railroads.
- Rail Passenger Association of California
- Offering online publications and links to other rail passenger associations.
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