AAR (Association of American Railroads)

AAR Test Center: AAR Tests

American Association of Private Railroad Car Owners (AAPRCO)

American Association of Railroad Superintendents (AARS)

American Chemistry Council

The American Passenger Rail Coalition (ARPC)

American Railway Car Institute (ARCI)

American Public Transportation Association (APTA)

AREMA (American Railway Engineering and Maintenance-of-Way Assoc.)

ASLRRA (American Short Line and Regional Railroad Association)

Asociacion Internacional Ferroviaria (AIF)

Association of Car Accounting and Car Services Officers

Australasian Railway Association

Canadian Transportation Agency (CTA)

Council of Supply Chain Management Professionals (CSCMP)

Federal Railroad Administration-U.S. Department of Transportation

High Speed Ground Transportation Association (HSGTA)

Intermodal Transportation Institute

Intermodal Association of North America (IANA)

International Rail Transport Committee

International Union of Railways

Institution of Railway Signal Engineers (IRSE)

Intelligent Transportation Society of America (ITS)

League of Railroad Industry Women (LIRW)

Mechanical Association Railcar Technical Services

National Association of Railroad Passengers (NARP)

National Association of Rail Shippers

National Association of Railway Business Women (NARBW)

National Corridors Initiative (NCI)

National Industrial Transportation League (NITL)

The National Railroad Construction and Maintenance Association Inc. (NRC)

National Railway Historical Society

National Transportation Safety Board (NTSB)

North American Railcar Operators' Association (NRCOA)

Office of the Rail Regulator (U.K.)

Operation Lifesaver

Rail Industry Forum (ISM)

Railroad Retirement Board(RRB)

Railway Association of Canada (RAC)

Railway Industrial Clearance Association of North America (RICA)

Railway Supply Institute

Railway Systems Suppliers Inc. (RSSI)

Railway Technology

Railway Tie Association (RTA)

REMSA (Railway Engineering-Maintenance Suppliers Assoc.)

Responsible Care (U.S.)

Traffic Club of Chicago

Traffic Club of Montreal

Traffic Club of New York

Transport Canada

Transportation Research Board

Transportation Safety Board of Canada

Transportation Technology Center

U.S. Department of Transportation (DOT)