Class I Railroads

• BNSF Railway Co.
• Canadian National Railway Co.
• Conrail
• CSX Corp.
• Ferrocarril Mexicano S.A. de C.V.
• Kansas City Southern (KCSR and KCSM)
• Norfolk Southern Corp.
• Union Pacific Corp.

Short-Line & Regional Railroads

• Aberdeen & Rockfish Railroad Co.
• Aberdeen, Carolina & Western Railway
• Alaska Railroad
• Albany & Eastern Railroad Co.
• Alexander Railroad Co.
• Anacostia & Pacific Co. Inc.
• Arkansas & Missouri Railroad
• Ashtabula, Carson & Jefferson Railroad
• Bay Colony Railroad
• Belt Railway Co. of Chicago
• Canton Railroad
• Central Midland Railway
• Chicago SouthShore and South Bend Railroad
• Columbia Basin Railway Co.
• East Camden & Highland Railroad Co.
• Effingham Railroad Co.
• Escanaba & Lake Superior Railroad Co.
• Essex Terminal Railway Co.
• Farmrail Corp.
• Finger Lakes Railway Corp.
• Florida East Coast Railway
• Fort Worth & Western Railroad
• Genesee & Wyoming Inc.
• Georgetown Railroad Co.
• Greenville & Western Railway Co. L.L.C.
• Heart of Georgia Railroad Inc.
• Hoosier Southern Railroad
• Illinois Western Railroad Co.
• Indiana Harbor Belt Railroad Co.
• Indiana Rail Road
• Iowa Interstate Railroad Ltd.
• Iowa Northern Railway
• Iowa Pacific Holdings L.L.C.
• Iowa, Chicago & Eastern Railroad Corp.
• Lake State Railway Co.
• Lancaster & Chester Railway
• Livonia, Avon & Lakeville Railroad Corp.
• Madison Railroad
• Maryland Midland Railroad Co.
• Meridian Southern Railway L.L.C.
• Middletown & Hummelstown Railroad Co.
• Modesto & Empire Traction Co.
• Montana Rail Link
• Montreal, Maine & Atlantic Railway Ltd.
• Mt. Hood Railroad Co.
• New Jersey Rail Carriers L.L.C.
• New Orleans Public Belt Railroad
• New York Susquehanna & Western Rail Co.
• North Shore Railroad System
• OmniTrax
• Ontario Northland
• Pacific Harbor Line Inc.
• Paducah & Louisville Railway Inc.
• Pan Am Railways
• Patriot Rail
• Pinsly Railroad
• Pioneer Railcorp
• Progressive Rail Inc.
• R J Corman Railroad Co.
• RailAmerica Inc.
• Reading & Northern Railroad
• Red River Valley & Western Railroad Co.
• Rio Grande Pacific Corp.
• Santa Fe Southern Railway Inc.
• Santa Maria Valley Railroad Co.
• Seminole Gulf Railway L.P.
• Sierra Railroad Co.
• South Carolina Public Railways
• Southern Railway of British Columbia Ltd.
• Strasburg Rail Road Co.
• Tishomingo Railroad
• Tri County Rail Co.
• Tulsa-Sapulpa Union Railway Co.
• Twin Cities & Western Railroad Co.
• Vermont Rail System
• Virginia Railroad Association
• Watco Cos. Inc.
• Western New York & Pennsylvania Railroad
• Wisconsin & Southern Railroad Co.

U.S. Passenger Rail Systems

• American Public Transportation Association
• Amtrak
• Amtrak - California
• Amtrak - Coast Starlight
• Amtrak - Texas Eagle
• California - Alamont Express
• California - Bay Area Rapid Transit
• California - Caltrain
• California - Los Angeles MTA
• California - Market Street Railway
• California - Metrolink
• California - Muni
• California - Sacramento RTA
• California - Santa Clara Valley TA
• Colorado - Denver RTA
• District of Columbia - Washington Metropolitan Area Transit Authority
• Florida - Tri-Rail
• Georgia - MARTA
• Grand Canyon Railway
• Illinois - Chicago Transit Authority
• Illinois/Indiana - South Shore Line
• Louisiana - New Orleans RTA
• Massachusetts - MBTA
• Missouri - Metrolink
• New Jersey - New Jersey Transit
• New York - MTA New York City Transit
• New York/New Jersey - Port Authority Trans-Hudson Corp.
• North Carolina - North Carolina DOT Rail Division
• Oregon - Tri-Met
• Pennsylvania - Port Authority of Allegheny County
• Pennsylvania - Southeastern Pennsylvania Transportation Authority
• Texas - Dallas Area Rapid Transit
• Virginia - Virginia Railway Express
•Washington - Sound Transit
• Wisconsin - Kenosha Transit

International Passenger Rail Systems

• Africa - Spoornet
• Australia - CityRail
• Australia -- RailCorp
• Australia - TranAdelaide
• Australia - West Coast Railway
• Austria - Austrian Federal Railway (German)
• Belgium - Belgische Eisenbahnen Belgian National Railway (English, German, French)
• Belgium - Bruxelles/Brüsel/Brussels (Dutch, French)
• Belgium - Charleroi (French)
• Canada - Société de transport de la Communauté urbaine de Montréal (French, English)
• Canada - Toronto Transit Commission
• Canada - VIA Rail Canada
• Denmark - Danish State Railways (Danish)
• Finland - Finnish Railways (English, Finnish)
• France - Lille Transpole Network (French)
• France - SNCF (English, French)
• Germany - Deutsche Bahn (English, German, French)
• Germany - Wuppertal, the Schwebabahn suspended railway (German, Dutch, French, English)
• Israel - Israel Railways (Hebrew)
• Italy - Azienda Trasporti Municipali (Italian, English)
• Italy - FS Online: Ferrovie (Italian, English)
• Italy - Napoli (Italian)
• Japan - Nagoya Railroad (Japanese)
• Malaysia - Keretapi Tanah Melayu Berhad
• Netherlands - Netherlands Railways (Dutch)
• New Zealand - Tranz Rail Holdings
• Norway - Norwegian State Railways (Norwegian)
• Portugal - Portuguese Railways (English, Portuguese)
• Singapore - Singapore Mass Transit Railway (English)
• Spain - RENFE, Spanish National Network of Railways (Spanish, English)
• Switzerland - Appenzeller Bahnen (German)
• Switzerland - Bremgarten-Dietiken-Bahn (German)
• Switzerland - Furka-Oberalp-Bahn (German, English, French)
• Switzerland - Golden Pass (English, German)
• Switzerland - Jungfrau Railways (German, English, French)
• Switzerland - Montreux-Oberland-Bahnen (German, French, English)
• United Kingdom - Croydon Tramlink
• United Kingdom - Docklands Light Railway
• United Kingdom - Eurostar
• United Kingdom - Gatwick Express
• United Kingdom - Regional Railways Northeast
• United Kingdom - Virgin Trains

Industry Associations

• American Association of Private Railroad Car Owners (AAPRCO)
• American Association of Railroad Superintendents (AARS)
• American Public Transportation Association (APTA)
• American Railway Engineering and Maintenance of Way Association (AREMA)
• American Short Line and Regional Railroad Association (ASLRRA)
• Asociación Internacional Ferroviaria (AIF)
• Association of American Railroads (AAR)
• Association of Car Accounting and Car Services Officers (ACACSO)
• Institution of Railway Signal Engineers (IRSE)
• Intelligent Transportation Society of America (ITS)
• Intermodal Association of North America (IANA)
• League of Railroad Industry Women (LIRW)
• National Association of Rail Shippers (NARS)
• National Association of Railroad Passengers (NARP)
• National Association of Railway Business Women (NARBW)
• National Corridors Initiative (NCI)
• National Industrial Transportation League (NITL)
• North American Railcar Operators' Association (NRCOA)
• Operation Lifesaver
• Railway Association of Canada (RAC/ACFC)
• Railway Engineering-Maintenance Suppliers Association (REMSA)
• Railway Industrial Clearance Association of North America (RICA)
• Railway Supply Institute
• Railway Systems Suppliers Inc. (RSSI)
• Railway Tie Association (RTA)
• The American Passenger Rail Coalition (ARPC)
• The National Railroad Construction and Maintenance Association Inc. (NRC)