The following are reporting marks assigned by the Association of American Railroads (AAR) to rail carriers operating in North America and the companies (railroads and rail equipment owners/operators) to which they were assigned. Where multiple railroads are listed on a reporting mark, their order indicates the order of the mark's assignment; the succession is usually through mergers or buyouts.
Reporting mark standard practices
An AAR reporting mark is a sequence of two to four letters that uniquely identifies the owner of a piece of railroad rolling stock. The ampersand symbol (&) is not considered part of the reporting mark. In general, the reporting mark is derived from the assigned company's initials.
Marks that end in X are assigned to rail car owners that are not common carrier railroads themselves (typically these are private car owners, leasing companies or railroad museums). Marks that end in Z are assigned to trailer owners/operators for use on equipment that does not have flanged wheels but that will be used on North American railroads in intermodal service. Marks that end in U are assigned to container owners/operators for use on equipment that will be used in intermodal service. Marks that end in any other letter are assigned to railroads for use on railroad equipment in interchange service.
External links
A
- AA - Ann Arbor Railroad
- AALX - Advanced Aromatics, LP
- AAMX - Arrendadora de Carros de Ferrocarril, SA
- AAR - Association of American Railroads
- AATX - Ampacet Corporation
- AAX - Agrico Chemical Company
- AB - Akron Barberton Cluster Railway
- ABB - Akron and Barberton Belt Railroad
- ABBX - Abbott Labs
- ABC - Atlanta, Birmingham and Coast Railroad
- ABCK - Alaska British Columbia Transportation Company
- ABCX - Falcon Coal Company
- ABIX - Anheuser-Busch, Inc.
- ABL - Alameda Belt Line
- ABOX - Railbox Company; TTX Corporation
- ABPR - Aberdeen and Briar Patch Railway
- ABR - Athens Lines LLC
- ABRX - AB Rail Investments, Inc.
- ABTX - GE Railcar Services Corporation
- ABWX - Asea Brown Boveri
- AC - Algoma Central Railway; Canadian National Railway
- ACAX - Allied Chemical Company; Honeywell International
- ACBL - American Commercial Barge Lines
- ACBX - Scandinavian Oil Company, Inc.
- ACCX - Consolidation Coal Company
- ACDX - Allied Chemical Company; Honeywell International
- ACEX - Atlantic Cement Company, Inc.; Ace Cogeneration Company
- ACFX - Shippers Car Line; ACF Industries, Inc.; GE Capital Railcar Services
- ACGX - Acme Gas Corporation; Suburban Propane, LP
- ACIS - Algoma Central Railway; Canadian National Railway
- ACIX - Arkansas Chemicals, Inc.; Great Lakes Chemical Corporation
- ACJR - Ashtabula Carson Jefferson Railroad
- ACJU - American Coastal Lines Joint Venture, Inc.
- ACL - Atlantic Coast Line Railroad; Seaboard System Railroad; CSX Transportation
- ACLU - Atlantic Container Line, Ltd.
- ACLX - American Car Line Company
- ACMX - Allis-Chalmers Corporation; Voith Hydro
- ACNU - AKZO Chemie, B V
- ACOU - Associated Octel Company, Ltd.
- ACOX - Aurora Cooperative Elevator Company (grain shippers)
- ACPX - Amoco Canada Petroleum Company, Ltd.; Amoco Oil Company
- ACPZ - American Concrete Products Company
- ACRC - Andalucia and Conecuh Railroad
- ACRX - American Chrome and Chemicals, Inc.
- ACSU - Atlantic Cargo Services, AB
- ACSX - First Union Properties, Inc.; Honeywell International
- ACSZ - American Carrier Equipment
- ACTU - Associated Container Transport (Australia), Ltd.
- ACTX - Allied Chemical Company; Honeywell International
- ACUU - Acugreen Limited
- ACWR - Aberdeen Carolina and Western Railway
- ACWZ - Union Pacific Railroad
- ACXU - Atlantic Cargo Services, AB
- ACXX - Anderson Columbia Company, Inc.
- ACY - Akron, Canton and Youngstown; Norfolk Southern
- ACZX - A C Railroad Service Company
- AD - Norfolk, Franklin and Danville Railway
- ADBF - Adrian and Blissfield Railroad
- ADCU - Flexi-Van Leasing, Inc.
- ADIR - Adirondack Railway
- ADKU - AGA A/S
- ADMX - Archer Daniels Midland
- ADN - Ashley, Drew and Northern Railway; Arkansas, Louisiana and Mississippi Railroad
- ADRX - Addeleston Recycling Corporation
- ADSX - Andrew Merrilees, Ltd.
- AEC - Atlantic and East Carolina Railway
- AECX - Associated Electric Cooperative, Inc.
- AEFR - Aurora Elgin and Fox River Electric
- AEIX - Alan Eslisk
- AEIZ - Farrell Lines, Inc.
- AEPU - American Lines, Inc.
- AEPX - American Electric Power Service Corporation
- AERC - Albany and Eastern Railroad
- AESX - A. E. Staley Manufacturing; GE Railcar Services Corporation
- AEVX - AKZO Coatings, Inc.
- AEX - The Andersons
- AF - Alabama and Florida Railway
- AFCU - Afram Lines, Inc.
- AFCX - Atel Capital Equipment Fund
- AFCZ - Afram Lines, Inc.
- AFEX - Farmers Elevator Company of Arthur, ND
- AFFX - AFFCAR, Inc.
- AFIU - ABS Industrial Verification, Inc.
- AFIZ - Agmark Foods
- AFLR - Alabama and Florida Railroad
- AFPX - Fibers and Plastics Company (Allied Corporation); Honeywell International
- AFRX - AF Railway Industries, Inc.
- AFSX - Astoria, LLC
- AFTX - American Freedom Train
- AG - Galveston Railroad
- AGCR - Alamo Gulf Coast Railroad
- AGCX - Alberta Gas Chemicals, Inc.; PROCOR
- AGEX - A. G. Pipe Lines, Inc.; Nova Chemicals, Ltd.
- AGFX - Anchor Gas and Fuel Company, Inc.
- AGHX - Agrium US, Inc.
- AGIX - AGRI Financial Services, Inc.; AGRI Industries
- AGLF - Atlantic and Gulf Railroad; Knoxville and Holston River Railroad
- AGLX - Andrews Gas Liquids Service; Andrews Petroleum
- AGMX - Terra Nitrogen, LP
- AGPX - AG Processing, Inc.
- AGR - Alabama and Gulf Coast Railway
- AGRD - A and G Railroad
- AGRX - Agrifos, LLC
- AGS - Alabama Great Southern Railroad
- AGYX - American Gypsum Company; Centrex Construction Products, Inc.
- AHCX - Arcadian Corporation
- AHMX - Altos Homos de Mexico, SA de CV
- AHT - Alaska Hydro-Train
- AHW - Ahnapee and Western Railway; Green Bay and Western; Fox Valley and Western; Wisconsin Central; Canadian National Railway
- AHWZ - Fox Valley and Western
- AICX - Hoeganaes Corporation
- AIDU - Albermarle Corporation
- AIEU - Aviation Import Export, Inc.
- AIIZ - III Transportation
- AINX - TTX Company (Acorn Division)
- AIPX - Atlas Iron Processors, Inc.
- AITU - Western Intermodal
- AJCU - Australia Japan Container Line
- AJPX - North American Chemical Company; IMC Chemicals
- AKDN - Acadiana Railway
- AKFX - AKF Corporation
- AKLU - K Line
- AKMD - Arkansas Midland Railroad
- AKMX - Helm Financial Corporation
- AKZX - AKZO Nobel Chemicals, Inc.
- AL - Almanor Railroad
- ALAB - Alabama Railroad
- ALAX - Lyondell Petrochemical; Equistar Chemicals, LP
- ALBX - Albert City Elevator
- ALCX - Aluminum Company of Canada, Ltd.; Alcan Smelters and Chemicals, Ltd.
- ALEX - AGRI Financial Services, Inc.; AGRI Industries
- ALGX - Amsterdam Leasing
- ALLX - Alliance Machine Company
- ALLZ - Alliance Shippers
- ALM - Arkansas, Louisiana and Missouri Railroad
- ALMX - Trinity Rail Management, Inc.
- ALNX - Government of Alberta
- ALPX - Government of Alberta
- ALQS - Aliquippa and Southern Railroad
- ALRX - A and R Leasing, LLP
- ALS - Alton and Southern Railway
- ALSX - Albis Canada, Inc.
- ALTU - VTG Vereinigte Tanklage U Transportmittel, GMBH
- ALTX - Southern Illinois Railcar, Inc.
- ALUX - Alumax of South Carolina, Inc.
- ALWX - GE Railcar Services Corporation
- ALY - Allegheny and Eastern Railroad
- AM - Arkansas and Missouri Railroad
- AMAX - AMAX Coal Company
- AMBU - Amber Line, Inc.
- AMBX - Amherst Industries, Inc.; American Boiler Works, Inc.
- AMC - Amador Central Railroad; Arkansas, Louisiana and Mississippi Railroad
- AMCX - Amoco Chemicals Corporation; Amoco Oil Company; BP Amoco Chemical Company (Chemical Division)
- AMCZ - Interbulk, Inc.
- AMEX - Albamex; Allied Entreprises
- AMFU - Amphibious Container Leasing, Ltd.
- AMGX - AMG Resources Corporation
- AMHR - Amherst Industries, Inc.; Landisville Railroad
- AMIU - American Marine Industries
- AMIX - Railcar Leasing Specialists, Inc.
- AMIZ - American Marine Industries
- AMLX - American Railcar Company
- AMMU - Hyundai
- AMMX - Amoco Minerals Company; Kentucky-Tennessee Clay Company
- AMNX - American Railcar Leasing Partners
- AMOX - Amoco Oil Company; BP Products North America, Inc.
- AMOZ - American Oil Company
- AMPX - GE Railcar Services Corporation
- AMR - Arcata and Mad River Railroad
- AMRU - Alaska Marine Lines, Inc.
- AMRX - Consolidated Oil and Transportation Company, Inc.
- AMRZ - American Chassis Leasing, Inc.
- AMSX - AllTrans Management Services Corporation
- AMTK - Amtrak
- AMTZ - Amtrak
- AMWX - Amway Corporation
- AMXU - Americas Marine Express, Inc.
- AN - Apalachicola Northern Railroad; AN Railway
- ANAU - Alliance Navigation Line, Inc.
- ANAX - Excel Railcar Corporation; GE Rail Services Corporation
- ANBX - Anbel Corporation
- ANCX - Norit Americas, Inc.
- ANDX - Andesite Rock Company
- ANIX - Associacion National de la Industria Quimca, A.C.
- ANKX - A and K Railroad Materials, Inc.
- ANR - Angelina and Neches River Railroad
- ANSX - Ansco Investment Company
- ANY - Athabasca Northern Railway
- AOCU - Associated Octel
- AOCX - Aluminum Company of America (Alcoa)
- AOEX - American Orient Express Railway
- AOIX - Marathon Ashland Petroleum Company
- AOK - Arkansas-Oklahoma Railroad
- AOR - Aliquippa and Ohio River Railroad
- AOUX - Alberta and Orient Glycol Company, Ltd.
- APA - Apache Railway
- APAX - West Penn Power Company; Cimentos Apasco, SA de CV
- APCU - American President Lines, Ltd.
- APCX - Allied Products Company; Allied Lime Company
- APD - Albany Port District
- APEX - Apex Tank Car Line
- APHX - Air Products Polymers, LP
- APIX - The Commonwealth Plan, Inc.
- APLU - American President Lines, Ltd.
- APLX - APL Land Transport Services, Inc.
- APLZ - American President Lines, Ltd.
- APMU - Maersk Lines
- APMX - Air Products Manufacturing Company
- APMZ - Maersk Equipment Service Company
- APNC - Appanoose County Community Railroad
- APOX - Alabama Power Company
- APRX - Air Products and Chemicals Company
- APSX - Arizona Public Service Company
- APTX - Air Products and Chemicals, Inc.
- APWX - Appalachian Power Company
- APXX - Alberta Prairie Rail Excursions
- AQCX - Aqua-Chem, Inc. (Celaver Brooks Division)
- AR - Aberdeen and Rockfish Railroad
- ARA - Arcade and Attica Railroad
- ARC - Alexander Railroad Company
- ARCX - Alaska Rail Car Company; Arizona Rail Car, Inc.
- ARDP - Missouri Pacific Railroad; Union Pacific Railroad
- ARDU - CATU Containers, SA
- ARE - A and R Line, Inc.
- AREX - Aeropres Corporation
- ARGX - Associated Railcar, Inc.
- ARHU - CATU Containers, SA
- ARHX - Arch Mineral Corporation
- ARIX - Arco Industrial Gases (a division of Arco, Inc.); GE Rail Services Corporation
- ARJX - Arch Chemicals
- ARMH - Missouri Pacific Railroad; Union Pacific Railroad
- ARMN - Missouri Pacific Railroad; Union Pacific Railroad
- ARMX - American Rail and Marine Corporation
- ARMZ - Armasal Line
- ARN - Alberta RailNet, Inc.
- AROX - GATX Corporation
- ARPX - Arco Petroleum Products Company; BP Products North America, Inc.
- ARR - Alaska Railroad
- ARRX - Anaconda Minerals Company; Anthracite Railroads Historical Society, Inc.
- ARSX - Aristech Chemical Corporation; Sunoco, Inc.
- ART - American Refrigerator Transit Company
- ARTU - CATU Containers, SA
- ARW - Arkansas Western Railway
- ARWX - Alabama River Woodlands, Inc.
- ARZC - Arizona and California Railroad
- ASAB - Atlanta and St. Andrews Bay Railway; Bay Line Railroad, LLC
- ASCX - Algoma Steel Corporation; Armco Steel Company, LP
- ASDA - Asbestos and Danville
- ASDX - Allied Services
- ASFX - American Steel Foundries, Inc.
- ASGX - Anchorage Sand and Gravel Company; Ash Grove Cement Company
- ASHU - Maritainer France, SA
- ASHX - General American Transportation Corporation; American Soda, LLP
- ASLX - Algoma Steamships, Ltd.
- ASML - Atlanta, Stone Mountain and Lithonia Railway
- ASR - Allegheny Southern Railroad
- ASRW - Allegheny Southern Railway
- ASRX - Amstar Corporation; Domino Sugar Company
- ASRY - Ashland Railway
- ASRZ - Agri/Share Cooperative
- ASTX - Asarco, Inc.
- ASYX - Avondale Shipyards, Inc.
- ATAX - Arizona Transit Assembly
- ATCO - Arnold Transit
- ATCX - Southern Illinois Railcar, Inc.
- ATEX - Asplundh Tree Expert Company (Railroad Division)
- ATGU - Burlington Northern Santa Fe Railway
- ATGX - ATEL Leasing Corporation
- ATIU - Societe Auxillaire De Transport Et D'Industries
- ATIX - Alstom Transportation, Inc.
- ATLT - AT and L Railroad
- ATLU - American Marine Industries
- ATLX - Atlas Machine and Iron Works, Inc.
- ATLZ - American Marine Industries
- ATMX - United States Department of Energy (Albuquerque Operations Office)
- ATOU - Atochem
- ATRW - Anthracite Railway
- ATSF - Atchison, Topeka and Santa Fe Railway; Burlington Northern Santa Fe Railway
- ATTX - Trailer Train Company; TTX Corporation
- ATW - Atlantic and Western Railway
- AUBX - US Plastic Lumber, Ltd.
- AUG - Augusta Railroad
- AUS - Augusta and Summerville Railroad
- AVCX - AVCO Aerostructures Division
- AVL - Aroostook Valley Railroad
- AVLU - Allied Van Lines
- AVR - Allegheny Valley Railroad
- AWCX - Airco Welding Products
- AWDX - Atlantic of New York, Inc.
- AWIX - Albright and Wilson Americas, Inc.
- AWP - Atlanta and West Point; Seaboard System Railroad; CSX Transportation
- AWW - Algers Winslow and Western Railway
- AWXX - East Carbon Development Company
- AWZZ - McCloud Railway Company
- AXCU - Ace Transportation Company
- AXXZ - Agricultural Express of America
- AYSS - Allegheny and South Side
- AZCR - Arizona Central Railroad
- AZCX - Azcon Corporation
- AZEK - Arizona Electric Power Cooperative, Inc.
- AZER - Arizona Eastern Railway
- AZEX - Arizona Electric Power Cooperative, Inc.
- AZMX - Arizona Railway Museum
- AZXX - Arizona Chemical Company
B
- BA - Conrail
- BADX - Baden Investment Company
- BAEX - Farmers Elevator Company of Bondurant, IA; The Andersons
- BALX - Bayer Corporation
- BANU - Bank Winter and Co Aktiengesellschaft
- BAP - Butte, Anaconda and Pacific
- BAPX - Bay Area Piggyback, Inc.
- BAR - Bangor and Aroostook Railroad; Montreal, Maine and Atlantic
- BARU - Barons Leasing Corporation
- BARZ - Bangor and Aroostook Railroad; Montral, Maine and Atlantic
- BASX - Bay State Milling Company
- BAWX - Babcock and Wilcox Company
- BAYL - Bay Line Railroad LLC
- BAYU - Mobay Chemical Corporation
- BAYX - Union Tank Car Company; Bayer Corporation
- BAZX - Bay Chemical Company, Inc.
- BB - Buckingham Branch Railroad
- BBCX - BBC Brown Boveri, Inc.; ABB Power Generation, Inc.
- BBRX - Bombardier, Inc. (Transportation Equipment Group)
- BBSZ - Barbar Steamship Lines, Inc.
- BBTU - Bress Bulk International Bulk Transport and Consulting
- BCAX - Blue Circle, Inc.
- BCCX - Border Chemical Company, Ltd.
- BCDX - Borden Chemical, Inc. (a division of Borden, Inc.)
- BCE - British Columbia Hydro and Power Authority
- BCFX - GE Railcar Services Corporation
- BCGX - Bay Cities Gas Corporation
- BCH - British Columbia Hydro and Power Authority; Southern Railway of British Columbia
- BCIT - British Columbia Railway
- BCIU - Bay Cities Leasing Company
- BCIX - Blue Circle, Inc.
- BCJU - Bay Cities Leasing Company
- BCK - Buffalo Creek Railroad; Conrail
- BCLR - Bay Colony Railroad
- BCLU - Bibby Bros. Company
- BCMX - Bullet Concrete Materials Company
- BCNE - Canadian National Railway
- BCOL - British Columbia Railway
- BCPX - Brighton Corporation
- BCRR - Boyne City Railroad
- BCRX - GE Rail Services Corporation
- BCRY - Barrie-Collingwood Railway
- BCTX - Boise Cascade Corporation
- BCTZ - Boise Cascade Corporation
- BCVX - West Coast Express
- BCWX - Union Tank Car Company
- BCYU - Bay Cities Leasing Company; Union Pacific Railroad
- BDCX - Anchor Glass Container
- BDLX - BDL Company
- BDMX - Blue Diamond Mining, Inc.
- BDNX - Baroid Division, NL Industries, Inc.; Baroid Drilling Fluids, Inc.
- BDRV - Belvidere and Delaware River Railway
- BDTL - Ballard Terminal Railroad
- BDW - Bighorn Divide and Wyoming Railroad
- BE - Conrail
- BECX - FMC Corporation (Inorganic Chemicals Division)
- BEEM - Beech Mountain Railroad
- BEKR - Berks Rail Corporation
- BELX - Bell Processing, Inc.
- BENX - Bennett Lumber Products, Inc.; Investors Property Service
- BEPX - Coastal States Energy Company
- BFC - Bellefonte Central Railroad
- BFCF - Bremerton Freight Car Ferry
- BFCX - Berwick Freight Car Company
- BFFX - Berwick Forge and Fabrication Division Whittaker Corporation
- BFGX - BF Goodrich Company (Chemical Group); Oxy Vinyls, LP
- BFHU - Bailee Freight Services, Ltd.
- BFIX - Bethlehem Steel Corporation
- BFJR - Brillion and Forest Junction Railroad
- BFPX - Besse Forest Products
- BFRX - Bakery Trading Company
- BFSU - Bailee Freight Services, Ltd.
- BGEX - General American Marks Company
- BGFX - Barnabas Group Foundation
- BGKU - Schering, AG
- BGSX - Strata Corporation
- BH - Bath and Hammondsport Railroad; B and H Rail Corporation
- BHCU - Bridgehead Container Service
- BHP - BHP Nevada Railroad
- BHTX - Bernhart Crane and Rigging Company
- BHWY - Boot Hill and Western Railway
- BIAX - Ocala Recycling
- BICX - Beker Industries Corporation
- BIDU - Universal Bulk-Handling, Ltd.
- BIGX - Big Three Industries, Inc.; Air Liquide America Corporation
- BIRR - Bellingham International Railroad
- BISX - Brandenburg Industrial Service Company
- BITY - Penn Eastern Rail Lines, Inc.
- BJGX - BJ Gas Supply, Inc.
- BJHX - B. J. Hughes, Inc.; BJ Titan Services Company
- BJOX - Citicorp Railmark, Inc.
- BJRY - Burlington Junction Railway
- BKLU - Bank Line Limited
- BKRR - Batten Kill Railroad
- BKRU - Baker Tanks
- BKTY - Missouri-Kansas-Texas Railroad; Union Pacific Railroad
- BLA - Baltimore and Annapolis Railroad
- BLCX - The Commonwealth Plan, Inc.
- BLE - Bessemer and Lake Erie Railroad
- BLKM - Black Mesa and Lake Powell
- BLKU - Bulkhaul Company
- BLKZ - Mid-American Intermodal Equipment Corporation
- BLMR - Blue Mountain Railroad
- BLOL - Bloomer Line
- BM - Boston and Maine Corporation
- BMAZ - Better Asset Management; Transamerica Leasing
- BMCX - Bluewater Michigan Chapter, Inc.
- BMDX - GE Railcar Services Corporation
- BMDZ - Minnesota, Dakota and Western Railway
- BMH - Beaufort and Morehead Railroad
- BMIZ - Burlington Motor Carriers
- BML - Belfast and Moosehead Lake Railroad
- BMRG - Blue Mountain and Reading Railroad
- BMS - Berlin Mills Railway; St. Lawrence and Atlantic Railroad
- BMSX - Bemis Company, Inc.
- BMT - Brooklyn-Manhattan Transit
- BMZ - Boston and Maine Corporation
- BN - Burlington Northern Railroad; Burlington Northern Santa Fe Railway
- BNAU - Burlington Northern Santa Fe Railway
- BNAZ - Burlington Northern Santa Fe Railway
- BNFE - Burlington Northern Railroad; Burlington Northern Santa Fe Railway
- BNIU - British and Irish Steam Packet Company
- BNML - Burlington Northern (Manitoba), Ltd.
- BNO - Burlington Northern Santa Fe Railway
- BNOW - Burlington Northern (Oregon-Washington), Inc.
- BNPZ - Pacific Rail Services
- BNQ - Burlington Northern Santa Fe Railway
- BNRQ - Burlington Northern Santa Fe Railway
- BNRZ - Burlington Northern Santa Fe Railway
- BNSF - Burlington Northern Santa Fe Railway
- BNXU - Burlington Northern Santa Fe Railway
- BNZ - Burlington Northern Santa Fe Railway
- BO - Baltimore and Ohio Railroad; CSX Transportation
- BOBX - Freeman Gas of N.C., Inc.
- BOCT - Baltimore and Ohio Chicago Terminal Railroad
- BOCX - BOC Gases
- BOCY - Boat Company
- BOGU - BSL Transport
- BONU - Bond International, Ltd.
- BOP - Border Pacific Railroad
- BORX - US Borax, Inc.
- BORZ - Ecorail, Inc.
- BOSU - W. BOS Vloeistof Transport, B.V.
- BOZ - CSX Transportation
- BPAX - United States Department of Energy (Bonneville Power Administration)
- BPAZ - Acme Markets, Inc.
- BPCU - BP Chemicals Belgium
- BPCX - Basin Electric Power Cooperative
- BPIX - Nova Chemicals, Inc.
- BPLU - M1 Engineering, Ltd.
- BPLX - Nova Chemicals, Inc.
- BPOX - BP Amoco Chemical Company (BP Oil Division)
- BPPX - Brewster Phosphates of Bradley, Florida; General American Marks Company
- BPRR - Buffalo and Pittsburgh Railroad
- BR - Bradford Industrial Rail, Inc.
- BRAN - Brandon Corporation
- BRAX - Brae Corporation; CIT Equipment Finance Corporation
- BRBX - Bombardier Transportation
- BRC - Belt Railway of Chicago
- BRCX - Bunge North America, Inc.
- BRCY - Cando Contracting, Ltd.
- BRE - Burlington Northern Railroad
- BREX - Big Rivers Electric Corporation
- BRFD - Branford Steam Railroad
- BRG - Brownsville and Rio Grande International Railroad
- BRIX - Incobrasa Industries; Union Tank Car Company
- BRKX - Burke Energy Corporation
- BRLX - BRS Leasing Company, Inc.
- BRNU - Brun, SA
- BRNZ - Comtrak, Inc.
- BROU - Swedish Transocean Lines
- BRR - Belton Railroad
- BRRC - Borinstein Railroad
- BRRX - Brooklyn Resource Recovery, Inc.
- BRSR - Blue Ridge Scenic Railway
- BRW - Black River and Western
- BS - Birmingham Southern Railroad
- BSCX - Bethlehem Steel Corporation
- BSDA - BSDA Railroad
- BSIX - Bethlehem Steel Corporation
- BSLU - Blue Star Line, Ltd.
- BSMX - Bay State Milling Company
- BSOR - Buffalo Southern Railroad
- BSPX - Otter Tail Power Company
- BSRX - Branson Scenic Railway
- BSTX - Trinitas Corporation
- BSVY - Boone and Scenic Valley Railroad
- BTAX - Big Three Lincoln-Alaska, Inc.; Air Liquide America Corporation
- BTC - Birmingham Terminal
- BTCO - Boston Terminal Company
- BTCU - Bulkmatic Transport Company
- BTCZ - Bulkmatic Transport Company
- BTEX - BTE Equipment, LLC
- BTLZ - Intermodal Services, Inc.
- BTRX - Rocky Mountain Transportation Services
- BTTX - Trailer Train Company; TTX Corporation
- BUDX - Budd Company
- BUDZ - Bud Antle, Inc.
- BUGX - Bruggere and Monson
- BUKX - Louisville Gas and Electric Company
- BUNX - The Buncher Company
- BUNZ - Burnside International Trucks, Ltd.
- BVCX - West Coast Express
- BVHX - BV Heddrick Gravel and Sand Company
- BVRY - Brandywine Valley Railroad
- BVS - Beveir and Southern Railroad
- BWC - Conrail
- BWCX - Borg-Warner Chemicals; GE Plastics
- BXBX - BXB Corporation
- BXN - Bauxite and Northern Railway
- BYCX - Battle Ground Yacolt and Chelatchie Prairie Railroad
C
- CA - Chesapeake and Albemarle Railroad
- CABU - Bacardi and Company, Ltd.
- CABX - Cabot Corporation
- CACV - Cooperstown and Charlotte Valley Railway
- CACZ - Comacasa Line
- CAD - Cadiz Railroad
- CADX - Cando Corporation
- CAFU - Bay Cities Leasing Company
- CAGX - MHC, Inc. (subsidiary of ConAgra)
- CAGY - Columbus and Greenville Railway
- CAGZ - Columbus and Greenville Railway
- CALA - Carolina Southern Railroad
- CALX - California Railcar Corporation
- CAMX - Canamax Commodity Corporation
- CANX - CANAC International, Inc.
- CAOX - Westlake CA and O
- CAPX - TransAlta Utilities Corporation
- CARR - Carrollton Railroad
- CARX - Carlon; Lamson and Sessions
- CARZ - Anton Caraton and Son
- CASO - Canada Southern Railway; Conrail; Canadian Pacific Railway
- CATU - CATU Containers, SA
- CAXU - Container Applications International, Inc.
- CBC - Carbon County Railway; Chemin de Fer Baie des Chaleurs, Inc. (Canada)
- CBCX - Colonial Brick Company, Inc.
- CBGR - Council Bluffs Railway
- CBHU - China Ocean Shipping Company
- CBIU - Combi Line-Lash
- CBIX - Central Bi-Products
- CBL - Conemaugh and Black Lick Railroad
- CBLU - Cooper Brothers Containers, Ltd.
- CBNS - Cape Breton and Central Nova Scotia Railway
- CBPU - CBSL Transportation Services, Ltd.
- CBQ - Chicago, Burlington and Quincy Railroad; Burlington Northern Railway; Burlington Northern Santa Fe Railway
- CBQZ - Chicago, Burlington and Quincy Railroad; Burlington Northern Railway; Burlington Northern Santa Fe Railway
- CBRM - Chillicothe-Brunswick Rail Maintenance Authority
- CBRW - Columbia Basin Railroad
- CBRX - Charles Barthoid
- CBRY - Copper Basin Railway
- CBYN - Crosbyton Railway
- CC - Chicago Central and Pacific Railway
- CCAX - FDJ Leasing
- CCBX - Union Carbide Corporation
- CCCL - Connecticut Central Railroad
- CCCU - Compass Container Company, Inc.
- CCCX - Carondelet Coke Corporation
- CCCZ - Compass Container Company, Inc.
- CCDX - Dayton Power and Light Company
- CCEZ - Chicago Central and Pacific Railroad
- CCFZ - Chi-Can Freight Forwarding
- CCGX - Cando Contracting, Ltd.
- CCHX - Columbian Chemicals Canada, Ltd.
- CCIM - Corpus Christie Terminal
- CCIX - Stauffer Chemical Company (Consolidated Chemical Division)
- CCIZ - Crete Intermodal
- CCKX - California Contemporary, Inc.; CCKX, Inc.
- CCKY - Chattooga and Chickamauga Railway
- CCLU - Char Ching Shipping (USA), Ltd.
- CCLX - Crystal Car Lines
- CCMX - Calcium Carbonate Company
- CCPR - Chelatchie Prairie Railroad
- CCPX - Canadian Chemical Producers
- CCQX - Construction Carrier, Inc.
- CCR - Corinth and Counce Railroad; Kansas City Southern Railway
- CCRA - Camp Chase Industrial Railroad
- CCRR - Claremont Concord Railroad
- CCRU - Compagnie Des Containers Reservoir
- CCRX - Coastal Refining and Marketing, Inc.
- CCRY - Charles City Railway
- CCRZ - Kansas City Southern Railway
- CCSU - Trans Ocean, Ltd.
- CCT - Central California Traction Company
- CCTU - Coordinated Caribbean Transport, Inc.
- CCTX - Central Power and Light Company
- CCTZ - Crowley Maritime Corporation
- CCUO - Chicago-Chemung Railroad
- CCWX - Coastal Chem, Inc.
- CCX - Columbian Chemicals Company
- CCXU - Char Ching Shipping (USA), Ltd.
- CCXX - Costain Coal, Inc.
- CDAC - Canadian American Railroad; Bangor and Aroostook Railroad; Montral, Maine and Atlantic
- CDAU - Canadian Tire Corporation, Ltd.
- CDAZ - Canadian Tire Corporation, Ltd.
- CDCX - Air Liquide America Corporation
- CDGX - Carolinas Domestic Gas Company, Inc.; Chatham Oil Company
- CDHX - Caledonian Rail Lines, LLC
- CDLZ - Cardinal Freight Carriers
- CDNU - Carotrans International
- CDPX - Chevron USA, Inc.
- CDTX - California Department of Transportation
- CDVX - Caddo Valley Railcar Repair, Inc.
- CEBX - Combustion Engineering, Inc.
- CEDR - Cedar River Railroad
- CEFX - CIT Equipment Finance Corporation
- CEI - Chicago and Eastern Illinois Railroad; Missouri Pacific Railroad; Union Pacific Railroad
- CEIW - Central Indiana and Western Railroad
- CELX - Celtran, Inc.
- CEMR - Central Manitoba Railway
- CEMX - Cementos Mexicanos, SA; Cemex Mexico, SA de CV
- CENX - Western Aggregates, Inc.
- CEPX - Cajun Electric Power Cooperative, Inc.; Trinity Industries Leasing
- CERA - Central Railroad of Indianapolis
- CERX - Carpenter Chemical Company; ER Carpenter, LLP
- CETU - Custom Environmental Transport, Inc.
- CEWX - Canadian Enterprise Gas Products
- CF - Cape Fear Railway
- CFKZ - XTRA Intermodal
- CFLX - Crestbrook Forest Industries
- CFMG - Chemin de Fer de MataPédia et Gaspésie (Canada)
- CFMX - Cargill, Inc.
- CFNR - California Northern Railroad
- CFPX - GE Railcar Services Corporation
- CFRU - Cardinal Freight Carriers
- CFSX - C and T Refinery, Inc.
- CFTX - Canadian Fertilizers, Ltd.
- CFWR - Caney Fork and Western Railway
- CG - Central of Georgia; Norfolk Southern
- CGA - Central of Georgia; Norfolk Southern
- CGAX - Cargill, Inc. (C.G.D. Division)
- CGBX - Procor, Ltd.; Dow Chemical Canada, Inc.
- CGCX - Continental Grain Company
- CGDX - Country Gas Distributors, Inc.; Eastern Propane Gas
- CGEX - Canadian General Electric Company, Ltd.; Cargill, Inc.
- CGFX - Consolidated Gas Company of Florida
- CGLX - Canadian General Transit
- CGMU - Compagnie Generale Maritime
- CGMX - GATX Rail Canada Corporation
- CGMZ - Compagnie Generale Maritime
- CGNE - Champagne Railroad, Inc.
- CGOX - Cargill, Inc.
- CGR - CG Railway
- CGRX - Consolidated Grain and Barge Company
- CGSX - Proflame Incorporated
- CGT - Canada and Gulf Terminal Railway
- CGTU - Compagnie Generale Maritime
- CGTX - Canadian General Transit
- CGW - Chicago Great Western Railway; Chicago and Northwestern; Union Pacific Railroad
- CHAU - Combined Transport Group, Inc.
- CHAX - Chartrand's Tank Car Service, Inc.
- CHEX - Chemplex Company; Equistar Chemicals
- CHFU - Challenge International
- CHH - Cheswick and Harmar
- CHIU - Chimco - Bulgaria
- CHLX - Chemleco, Inc.
- CHMX - C. H. Masland and Sons; First Union Rail
- CHP - Ferrocarril de Chihuahua al Pacifico, SA de CV; Ferrocarriles Nacionales de Mexico
- CHR - Chestnut Ridge Railway
- CHRC - Chaparral Railroad
- CHRR - Chesapeake Railroad
- CHRX - The Chesapeake Division
- CHSX - Cenex Harvest States Cooperative
- CHSZ - Intermodal Services, Inc.
- CHTS - Penn Eastern Rail Lines, Inc.
- CHTT - Missouri Pacific Railroad; Union Pacific Railroad
- CHV - Chattahoochee Valley Railway
- CHVX - Chevron Chemical Company
- CHW - Chesapeake Western Railway; Norfolk Southern
- CI - Cambria and Indiana Railroad
- CIC - Cedar Rapids and Iowa City Railway (Crandic)
- CIIX - Contico International, Inc.
- CIM - Chicago and Illinois Midland Railway
- CIND - Central Railroad of Indiana; Conrail
- CIPX - Central Illinois Public Service Company; Ameren Energy Generating Company
- CIR - City of Rochelle, Illinois
- CIRR - Chattahoochee Industrial Railroad
- CIRX - Consbec, Inc.
- CIRY - Central Illinois Railroad
- CISD - Colonel's Island Railroad
- CITU - Citroen
- CITX - PLM International
- CIW - Illinois Central Gulf; Illinois Central Railroad; Canadian National Railway
- CIXX - Calciner Industries, Inc.
- CJPX - General Electric Rail Services Corporation
- CKIX - C.K. Industries
- CKP - Colorado Kansas and Pacific Railway
- CKRY - Kansas and Oklahoma Railroad
- CKSI - Carthage Knightstown and Shirley Railroad
- CLC - Columbia and Cowlitz Railway
- CLCO - Claremont and Concord Railway
- CLCX - Union Oil Company of California; Chatahoochee Locomotive Company
- CLCZ - Complete Logistics Company
- CLDZ - Celadon Trucking Services, Inc.
- CLEX - Chemical Enterprises, Inc.; Cieco Corporation
- CLGR - Central Louisiana and Gulf Railroad
- CLGU - Costa Line Cargo Services
- CLIF - Cliffside Railroad
- CLIX - Calumet Lubricants
- CLK - Cadillac and Lake City Railway
- CLMX - Cyprus Sierrita Corporation
- CLNA - Carolina Coastal Railway
- CLOU - CLOU Container Leasing, GmbH
- CLOX - Clark Refining and Marketing, Inc.
- CLP - Clarendon and Pittsford Railroad
- CLPX - Boulder Scientific Company
- CLPZ - Clarendon and Pittsford Railroad
- CLRX - Clayton Rail
- CLSL - Columbia and Silver Creek Railroad
- CLSX - Cargill Incorporated (Salt Division)
- CLTU - Chemical Leaman Tank Lines, Inc.
- CLTX - Cloro de Tehuantepec, SA de CV
- CM - Central Montana Rail
- CMBU -
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