Africa

Southern Africa Railways Association

Argentina
Argentina Railways Institute (Fiaf)

Australia
Australasian Railway Association Inc
Australian Railway Industry Corporation (ARIC)
Railway Technical Society of Australia (RTSA)

Brazil
National Association of Railway Transport (ANTF)

Britain
Association of Train Operating Companies (ATOC)
Chartered Institute of Logistics & Transport (Britain)
Institution of Railway Signal Engineers (IRSE)
PTEG (Representing seven PTEs)
Rail Freight Group
Railway Forum
Railway Industry Association (RIA)

Canada
Association of Regional Railways of Canada (ARRC)
Canadian Urban Transit Association 
Railway Association of Canada

China
China Acadamy of Railway Sciences (Cars)

Europe
Association of the European Railway Industry (Unife)
Community of European Railway & Infrastructure Companies (CER)
Eurofima
European Association for Railway Interoperability (AEIF)
European Intermodal Association (EIA)
European Federation of Railway Trackworks Contractors (EFRTC)
European Rail Freight Association (ERAF)
European Rail Freight Customers Platform (ERFCP)
European Rail Infrastructure Managers (EIM)
European Railway Research Advisory Council (ERRAC)
European Railway Wheels Association (ERWA)
European Rail Traffic Management System (ERTMS)
Foundation for Railway Infrastructure Development
Intercontainer-Interfrigo
International Union of Combined Road-Rail Transport Companies (UIRR)
International Union of Private Wagons (UIP)
Nordic Association of Railway Professionals (NJS)
Union of European Railway Engineer Associations (UEEIV)

France
Railway Industry Association (FIF)
Railway Engineers & Executives Association (AFFI)
GART (Association of Transport Authorities)
Nord-Pas de Calais Railway Industry Association (AIF)

Germany
VDEI (German Association of Railway Engineers)
VDV (Association of Transport Operators)

International
Arab Union of Railways 
International Air Rail Organisation (IARO)
International Heavy Haul Association (IHHA)
International Organisation of Overhead Catenary Engineers (IOOCE)
International Transport Forum
International Union of Public Transport (UITP)
International Union of Railways (UIC)
Latin American Association of Underground Networks & Subways (ALAMYS)
Organisation for Railway Collaboration (OSShD/OSJD)

Iran
Iranian Association of Rail Transport Engineering

Italy
Italian Association of Railway Electrical Industries (ASSIFE)
Italian Railway Certification and Safety Organisation (Cesifer)

Japan
Association of Japanese Private Railways
High Speed Surface Transport
Japan Overseas Rolling Stock Association (Jorsa)

Korea
Korea Rolling Stock Industries Association (Korsia)

Netherlands
Railforum Netherlands

North America
Intermodal Association of North America (IANA)

South Africa
Railroad Association of South Africa 

South America
Association of Latin American Metros (Alamys) 
Latin American Railway Association

Spain
Spanish Association of Railway Equipment Manufacturers and Exporters (Mafex)

Sweden
Swedish Rail Industry Group (Swerig)

Switzerland
Swiss Union of Public Transport
Swissrail Export Association

USA
American Association of Private Car Owners
American Public Transit Association (APTA)
American Railway Engineering & Maintenance of Way Association
American Short Line and Regional Railroad Association
Association of American Railroads
California High Speed Rail Authority
Florida High Speed Rail
Railway Engineering-Maintenance Suppliers Association
Railway Systems Suppliers I
US High Speed Rail Association