| A | Alton R.R. | Jan-52 |
| AA | Ann Arbor R.R. Co. | 4/38-1/75; eliminated 1/78 |
| Ann Arbor R.R. System, Michigan Interstate Ry. Co., Operator | added 1/78; 1/80 | |
| Ann Arbor R.R. System, Michigan Interstate Ry. Co., Operator-in-Reorganization | eliminated 4/88 | |
| Ann Arbor R.R., Michigan Interstate Ry. Co., Operator-in-Reorganization | added 4/88 | |
| Ann Arbor R.R., Michigan Interstate Ry. Co., Operator-in-Reorganization (W. Clark Durant, Ill, Trustee) | eliminated 1/89 | |
| Ann Arbor R.R. Co. | added 1/89; 1/94-7/2000 | |
| AAAX | AAA Warehouse Corp. | Jan-94 |
| AACX | State of Alaska, Division of Agriculture | added 10/87; eliminated 10/90 |
| AADX | Airco Alloys and Carbide, a Division of Air Reduction Co. Inc. | added 7/68; 4/70 |
| Airco Alloys and Carbide, a Division of Airco, Inc. | eliminated 7/74 | |
| AAEX | American Aniline & Extract Co. | added 7/58; 4/61-10/66; eliminated 10/69 |
| AAKX | Amulco Asphalt Co. of Texas | Apr-38 |
| AALX | Advanced Aromatics, L.P. | Jul-00 |
| AAMX | Shippers' Car Line Division of ACF Industries, Inc. | added 1/73 |
| Arrendadora de Carros de Ferrocarril del Atlantico, S.A. | added 1/75; 1/75-1/80; eliminated 4/85 | |
| ACFA, Arrendadora de Carros de Ferrocarril, S.A. | added 4/85; 1/94-7/2000 | |
| AAR | Association of American Railroads | Jul-00 |
| AATX | Ampacet Corp. | added 10/78; 1/80; eliminated 10/94; added 10/96; eliminated 4/97; 7/2000 |
| AAX | American Agricultural Chemical Co. | 4/38-7/65; eliminated 4/66 |
| Agrico Chemical Co., Division of Continental Oil Co. | added 4/66 | |
| Agrico Chemical Co. | Oct-66 | |
| Agrico Chemical Co., Division of Continental Oil Co. | Apr-70 | |
| Agrico Chemical Co. | 1/75-1/80; eliminated 10/90 | |
| AB | Akron Barberton Cluster Ry. Co. | added 10/94; 7/2000 |
| A&BB | Akron & Barberton Belt R.R. | 7/23-4/38 |
| ABB | Akron & Barberton Belt R.R. Co. | 1/75-1/94; eliminated 4/95; 7/2000 |
| ABBX | Abbott Labs | added 1/82; eliminated 4/93; 1/94-7/2000 |
| ABCK | Alaska British Columbia Transportation Co. | 1/80-1/94 |
| ABCX | American Bitumuls Co. | 1/52-4/61 |
| Merchants Despatch Transportation Corp | added 7/66; 10/66-4/70; eliminated 1/73 | |
| Falcon Coal Co. | added 10/78; 1/80 | |
| Tennessee Valley Authority | Jan-94 | |
| ABEX | Abbey Chemical Corp. | 4/61-4/70; eliminated 4/73 |
| ABGX | American Black Granite Co. | 1/52-4/61 |
| ABIX | Anheuser-Busch, Inc. | 10/57-7/65; eliminated 10/65; added 1/74; 1/75; eliminated 7/78; 1/80-1/94; eliminated 10/96; 7/2000 |
| ABL | Alameda Belt Line | 1/75-1/94; eliminated 7/99; 7/2000 |
| ABLX | American Refrigerator Transit Co. | added 4/62; 7/65-1/75 |
| ABM | Texas and Pacific Railway Co. | 1/75; eliminated 1/77 |
| Missouri Pacific Railroad Co. | added 1/77 | |
| Missouri Pacific System | eliminated 4/79 | |
| ABN | Alabama Northern Ry. Co. | 23-Jul |
| Ashland Ry. | 4/38-1/52 | |
| ABOX | American Rail Box Car Co. | added 7/78; eliminated 7/79 |
| Railbox Company | added 7/79; 1/80-1/94; eliminated 4/2000 | |
| TTX Co. | added 4/2000; 7/2000 | |
| ABPR | Aberdeen and Briar Patch Ry. Co. | added 4/84; eliminated 1/88 |
| Aberdeen, Carolina & Western Ry. Co. | added 1/88; eliminated 1/92 | |
| ABPX | Animal By-Products Corp. | added 4/67; 4/70; eliminated 10/71 |
| ABRX | Abraham Bros. Packing Co. | Apr-38 |
| AB Rail Investments, Inc. | Jul-00 | |
| ABSX | American Crystal Sugar Co. | Apr-38 |
| ABTX | North American Car Corp. | added 4/66; 10/66-1/80 |
| General Electric Railcar Services Corp. | 1/94; eliminated 10/94 | |
| ABWX | Asea Brown Boveri, Inc. | added 7/90; 1/94-7/2000 |
| ABX | Adirondack Bottled Gas Corp. | 1/52-4/61; eliminated 1/62 |
| Home Gas Corp. of Great Barrington | added 1/62 | |
| AC | Algoma Central & Hudson Bay Ry. Co. | 7/23-7/65 |
| Algoma Central Ry. | 10/66-1/94; eliminated 4/95 | |
| Algoma Central R.R., Inc. | added 4/95 | |
| Algoma Central Ry., Inc. | added 10/95; 7/2000 | |
| ACAX | Allied Chemical Canada, Ltd. | eliminated 5/83 |
| Allied Chemical, a Division of Allied Canada, Inc. | added 5/83; eliminated 7/87 | |
| Allied Canada, Ltd. | added 7/87; eliminated 10/88 | |
| Allied Chemicals Canada, Inc. | added 10/88; eliminated 7/93 | |
| Allied Chemical Co. (Allied Corp.) | added 7/93; eliminated 1/99 | |
| AlliedSignal Inc. | added 1/99; eliminated 7/2000 | |
| Honeywell International, Inc. | added 7/2000; 7/2000 | |
| ACBL | American Commercial Barge Lines, Inc. (American Commercial Barge Line Division) | 1/75-1/80 |
| American Commercial Barge Lines, Inc. | Jan-94 | |
| American Commercial Barge Lines, Inc. (American Commercial Barge Line Division) | Jul-00 | |
| ACBX | Scandanavian Oil Co., Inc. | added 4/74; 1/75-1/80; eliminated 10/88 |
| ACCX | Ansul Chemical Co. | 4/38-4/61; eliminated 7/64 |
| The Ansul Co. | added 7/64; 7/65-1/80; eliminated 5/83 | |
| Consolidation Coal Co. | added 4/90; 1/94-7/2000 | |
| ACDX | First Union Properties, Inc. | 7/65-1/80; eliminated 7/84 |
| Allied Chemical Co. (Allied Corp.) | added 7/84 | |
| Allied Chemical Co. | Jan-94 | |
| Allied Chemical Co. (Allied Corp.) | eliminated 1/99 | |
| AlliedSignal Inc. | added 1/99; eliminated 7/2000 | |
| Honeywell International, Inc. | added 7/2000; 7/2000 | |
| ACEX | Atlantic Cement Co., Inc. | added 7/73; 1/75-1/80; eliminated 4/86 |
| Blue Circle Atlantic Inc. | added 4/86; eliminated 4/87 | |
| Ace Cogeneration Co. | added 1/93; 1/94-7/2000 | |
| ACFX | American Car & Foundry Co. | Apr-38 |
| American Car & Foundry Co. -- temporary expiring 31Dec52 | Jan-52 | |
| A.C.F. Industries -- temporary expiring 10Jan58 | Oct-57 | |
| A.C.F. Industries -- temporary expiring 15Oct61 | Apr-61 | |
| Shippers' Car Line Division of ACF Industries, Inc. | added 4/68; 4/70-1/80; eliminated 4/88 | |
| ACF Industries, Inc. | added 4/88; 1/94; eliminated 7/97 | |
| General Electric Railcar Services Corp. | added 7/97; eliminated 1/2000 | |
| General Electric Rail Services Corp. | added 1/2000; 7/2000 | |
| ACGX | Acme Gas Corp. | added 7/74; 1/75-1/94; eliminated 4/97 |
| Suburban Propane, L.P. | added 4/97; 7/2000 | |
| ACHX | Allis-Chalmers Manufacturing Co. | Apr-38 |
| Atlas Chemical Co. | 1/52; eliminated 7/56 | |
| Armour and Co. | 7/65-10/66 | |
| Armour Car Lines | eliminated 10/68 | |
| USS Agri-Chemicals, Inc. | added 10/68 | |
| USS Agri-Chemicals, Inc., Subsidiary of United States Steel Corp. | eliminated 4/70 | |
| USS Agri-Chemicals, Inc., Division of United States Steel Corp. | added 4/70; 4/70-1/80 | |
| American Cyanamid Co. | 1/94; added 10/96; eliminated 4/97; 7/2000 | |
| ACIS | Algoma Central Ry. | added 4/74; 1/75-1/94; eliminated 4/95 |
| Algoma Central R.R., Inc. | added 4/95 | |
| Algoma Central Ry., Inc. | added 10/95-7/2000 | |
| ACIX | Arkansas Chemicals, Inc. | added 4/61; 4/61-1/94; eliminated 1/98 |
| Great Lakes Chemical Corp. | added 1/98; 7/2000 | |
| ACJR | Ashtabula Carson Jefferson R.R. Co., Inc. | added 10/87; 1/94-7/2000 |
| ACKX | Armstrong Cork Co. | Apr-38 |
| Armstrong Cork Co., Linoleum Division | 1/52-7/65 | |
| Armstrong Cork Co. | eliminated 1/66 | |
| ACL | Atlantic Coast Line R.R. Co. | 7/23-4/70 |
| Seaboard Coast Line R.R. Co. | 1/75-1/80; eliminated 1/83 | |
| Seaboard System R.R., Inc. | added 1/83; eliminated 7/87 | |
| CSX Transportation, Inc. | added 7/87; 1/94-7/2000 | |
| ACLX | American Car Line Co. | 1/94-7/2000 |
| ACMX | Allis-Chalmers Manufacturing Co. | added 10/57; 10/57-4/70; eliminated 10/71 |
| Allis-Chalmers Corp. | added 10/71; 1/75-1/80; eliminated 7/86 | |
| Allis-Chalmers Hydro, Inc. | added 7/86; eliminated 1/87 | |
| Voith Hydro, Inc. | added 1/87; eliminated 7/89; 1/94-7/2000 | |
| ACOX | Wright Chemical Corp. | added 1/65; 7/65-10/66; eliminated 1/67 |
| Aurora Cooperative Elevator Co. | added 10/70; 1/75-1/80; eliminated 1/90 | |
| Chrysler Rail Transportation Corp. | added 1/90; 1/94; eliminated 1/97 | |
| ACPX | Amoco Canada Petroleum Co., Ltd. | added 1/81; eliminated 1/93 |
| CGTX Inc. | added 1/93; 1/94; eliminated 10/97 | |
| Amoco Oil Co. | added 1/98; 7/2000 | |
| ACRC | Andalusia & Conecuh R.R. Co., Inc. | eliminated 10/90; 1/94 |
| ACRX | American Chrome & Chemicals Inc. | added 4/80; 1/94; eliminated 7/98; 7/2000 |
| ACSX | First Union Properties, Inc. | 7/65-1/94; eliminated 1/99 |
| AlliedSignal Inc. | added 1/99; eliminated 7/2000 | |
| Honeywell International | added 7/2000; 7/2000 | |
| ACTX | Allied Chemical Corp. | added 10/72; 1/75-1/80; eliminated 4/82 |
| Allied Chemical Co. (Allied Corp.) | added 4/82; 1/94; eliminated 1/99 | |
| AlliedSignal Inc. | added 1/99; eliminated 7/2000 | |
| Honeywell International, Inc. | added 7/2000; 7/2000 | |
| ACWR | Aberdeen Carolina & Western Ry. Co. | added 4/88; eliminated 10/93; 1/94; eliminated 7/94; 7/2000 |
| ACVX | American Cider & Vinegar Co. | 4/38-1/52 |
| ACX | Associated Cooperatives, Inc. | 10/57-4/61 |
| ACXX | Anderson Columbia Co., Inc. | Jul-00 |
| ACY | Akron, Canton & Youngstown R.R. Co. | 4/38-1/75; eliminated 1/77; eliminated 1/82 |
| Norfolk and Western Railway Co. | added 1/77; 1/80; eliminated 1/91 | |
| Norfolk Southern Ry. Company | added 1/91; 1/94-7/2000 | |
| AD | Atlantic and Danville Ry. | 10/57-4/61 |
| Norfolk, Franklin & Danville Ry. Co. | Jul-65 | |
| Atlantic and Danville Ry. Co. (Norfolk, Franklin and Danville Ry. Co.) | Oct-66 | |
| Norfolk, Franklin and Danville Ry. | 4/70-1/75; eliminated 1/75; 1/80 | |
| ADBF | Adrian & Blissfield Rail Road Co. | added 7/93; 1/94-7/2000 |
| ADIR | Adirondack Ry. Corp. | Jan-80 |
| ADMX | North American Car Corp. | added 1/60; 4/61-1/75 |
| ADM LEASCO | added 1/80; 1/80; eliminated 10/80 | |
| ADM Transportation Co. | added 10/80; 1/94-7/2000 | |
| ADN | Ashley, Drew & Northern Ry. Co. | 1/75-1/94; eliminated 10/96 |
| Arkansas Louisiana & Mississippi R.R. Co. | added 10/96; 7/2000 | |
| ADRX | Addlestone Recycling Corp. | Jul-00 |
| ADSX | A.D. Schader | 1/52-4/61 |
| Andrew Merrilees Ltd. | Jul-00 | |
| ADX | Abbotts Dairies, Inc. | 4/38-1/52 |
| AE | Arizona Eastern R.R. Co. | 23-Jul |
| AEC | Atlantic and East Carolina Ry. Co. | 1/52-1/75; eliminated 4/78; 1/80-7/2000 |
| AECX | American Extract Co. | 4/38-10/57; eliminated 10/59 |
| Associated Electric Cooperative, Inc. | added 10/94; 7/2000 | |
| AEFR | Aurora Elgin & Fox River Electric | 1/94-7/2000 |
| AEIX | Alan Eslisk | 1/94-7/2000 |
| AEPX | Appalachian Electric Power Co. | 1/52-10/57; eliminated 10/58 |
| Appalachian Power Co. | added 10/58; 4/61-4/70; eliminated 4/75 | |
| American Electric Power Service Corp. (cars being restencilled from APWX) | Jan-75 | |
| American Electric Power Service Corp. | added 4/75; 1/80-7/2000 | |
| AER | Algoma Eastern Ry. | Apr-38 |
| AERC | Albany & Eastern R.R. Co. | added 10/99; 7/2000 |
| AESX | A.E. Staley Manufacturing Co. | Apr-38 |
| North American Car Corp. | 1/52-1/80 | |
| General Electric Railcar Services Corp. | 1/94; eliminated 1/2000 | |
| General Electric Rail Services Corp. | added 1/2000; 7/2000 | |
| AEVX | AKZO Coatings Inc. | added 4/91; 1/94; eliminated 4/95; 7/2000 |
| AEX | Anderson Elevator Co. | 10/57-4/61 |
| The Andersons | 7/65-7/2000 | |
| AF | Alabama & Florida Ry. Co. | 1/94-7/2000 |
| AFCX | Atel Capital Equipment Fund 7, L.P. | added 1/99; 7/2000 |
| AFEX | Farmers Elevator Co. of Arthur, ND | added 10/80; eliminated 4/89 |
| AFFX | AFFCAR, Inc. | added 5/83 |
| AFIX | FIXCOR Industries, Inc. | Jul-00 |
| AFLR | Alabama and Florida R.R., Inc. | added 1/87; eliminated 10/87; eliminated 4/92; 1/94-7/2000 |
| AFOX | Arkansas Fuel Oil Corp. | added 4/57; 10/57; 4/61; eliminated 1/62 |
| Cities Service Oil Co. | added 1/62 | |
| AFPX | Fibers and Plastics Co. (Allied Chemical Corp.) | added 1/80; 1/80; eliminated 5/83 |
| Fibers and Plastics Co. (Allied Corp.) | added 5/83; eliminated 1/90 | |
| Fibers Division (Allied Signal, Inc.) | added 1/90; 1/94; eliminated 1/95 | |
| AlliedSignal-Fibers | added 1/95; eliminated 1/99 | |
| AlliedSignal Inc. | added 1/99; eliminated 7/2000 | |
| Honeywell International, Inc. | added 7/2000; 7/2000 | |
| AFRX | AF Ry. Industries, Inc. | Jul-00 |
| AFSX | Aaron Ferer & Sons Co. | 7/65-4/70; eliminated 10/72 |
| Astaris LLC | 7/2000; added 10/2000 | |
| AFTX | American Freedom Train | Jan-80 |
| AG | Abbeville-Grimes Ry. Co., Inc. | added 7/89; 1/94; eliminated 4/94 |
| Galveston R.R., L.P. | added 4/94 | |
| A&G R.R., L.L.C. | eliminated 1/97 | |
| The Bay Line R.R., L.L.C. | added 1/97; eliminated 7/97 | |
| Galveston R.R., L.P. | added 7/97; eliminated 4/98 | |
| The Bay Line R.R., L.L.C. | added 4/98; eliminated 7/98 | |
| Galveston R.R., L.P. | added 7/98; 7/2000 | |
| AGAX | Anchor Gasoline Corp. | added 4/54; 10/57-10/66; eliminated 1/67 |
| AGBX | A.G. Bartlett Co. | added 4/62; 7/65-10/66; eliminated 10/67 |
| AGCR | Alamo Gulf Coast R.R. Co. | added 7/96; eliminated 10/98; 7/2000 |
| AGCX | Ohio Tank Car Co. | Apr-38 |
| Vendome Tank Car Co. | 1/52-10/57; eliminated 7/60 | |
| North American Car Corp. | added 7/60; 4/61-1/75; eliminated 4/75 | |
| Alberta Gas Chemicals, Inc. | added 7/78; 1/80; eliminated 7/80 | |
| Alberta Gas Chemicals Ltd. | added 7/80; eliminated 4/90 | |
| Procor Ltd. | added 4/90; 1/94-7/2000 | |
| AGEX | A.G. Pipe Lines, Inc. | added 10/81 |
| AGEX | Nova Chemicals Ltd. | added 4/99; 7/2000; eliminated 7/2000 |
| AGFX | Anchor Gas and Fuel Transport, Inc. | added 1/62; 7/65-1/80; eliminated 10/82 |
| Anchor Gas and Fuel Co., Inc. | added 10/82; eliminated 7/87 | |
| AGHX | Agrium U.S. Inc. | added 10/96; 7/2000 |
| AGIX | AGRI Industries | added 4/79; 1/80 |
| AGRI Financial Services, Inc. | 1/94; eliminated 10/95 | |
| AGRI Industries | added 10/95; eliminated 4/2000; 7/2000 | |
| AGKX | Polar Supply, Inc. | eliminated 4/80 |
| AGLF | Atlantic and Gulf R.R. Co., Inc. | added 7/91; 1/94; eliminated 7/99 |
| Knoxville & Holston River R.R. Co., Inc. | added 7/99; 7/2000 | |
| AGLX | Andrews Gas Liquids Service | 1/80; eliminated 10/84 |
| Andrews Petroleum, Inc. | added 10/84; 1/94-7/2000 | |
| AGMX | Amalgamated Sugar Co. | added 7/64; 7/65-1/75 |
| Agricultural Minerals L.P. | added 1/95; eliminated 10/96 | |
| Terra Nitrogen Limited Partnership | added 10/96; 7/2000 | |
| AGPX | Chicago Freight Car Leasing Co. | 1/94; eliminated 10/95 |
| Ag Processing, Inc. | added 10/95; 7/2000 | |
| AGR | Alabama & Gulf Coast Ry. LLC | added 10/98; 7/2000 |
| AGRD | A&G R.R., L.L.C. | added 4/94; 7/2000 |
| AGRX | Agar Packing & Provision Co. (Mather Stock Car Co.) | Apr-38 |
| Agrifos L.L.C. | Jul-00 | |
| AGS | Alabama Great Southern R.R. Co. | 1/75-7/2000 |
| AGSX | Alabama-Georgia Syrup Co. | 1/52; eliminated 10/53 |
| AGTX | AmeriGas Propane L.P. | added 10/96; eliminated 7/99 |
| AGX | A. Guthrie & Co. | 1/52-4/61 |
| AGYX | Centex Construction Products, Inc., d/b/a American Gypsum Co. | Jul-00 |
| AHBX | Brown Chemical Co., Inc. | added 4/75; eliminated 7/78 |
| AHCX | Ansbacher-Hagerstown Chemical Corp. | Apr-38 |
| Arcadian Corp. | added 10/84; 1/94-7/2000 | |
| AHMX | Shippers Car Line Division of ACF Industries, Inc. | added 1/59; 4/61-1/80; eliminated 4/88 |
| ACF Industries, Inc. | added 4/88; 1/94; eliminated 10/96 | |
| Altos Hornos de Mexico, SA de CV | Jul-00 | |
| AHT | Alaska Hydro-Train | Jan-80 |
| AHW | The Ahnapee & Western Ry. Co., a Division of McCloud River R.R. Co. | 1/75; eliminated 7/77 |
| The Ahnapee & Western Ry. Co. | added 7/78; 1/80; eliminated 1/94 | |
| Fox Valley & Western, Ltd. | added 1/94; 7/2000 | |
| AICX | Ancor International Corp. | added 7/65; 7/65-1/80; eliminated 1/83 |
| Hoeganaes Corp. | added 1/83; eliminated 10/86 | |
| AIIX | Adams Industries, Inc. | added 10/69; 4/70-1/75; eliminated 10/78 |
| AINX | Trailer Train Co., Acorn Division | added 4/85; eliminated 1/92 |
| TTX Company, Acorn Division | added 1/92; 1/94-7/2000 | |
| AIPX | Atlas Iron Processors, Inc. | added 7/94; eliminated 7/97; 7/2000 |
| AIRX | American International Rail Services, LLC | Jul-00 |
| AIX | Antrim Iron Co. | Apr-38 |
| AJ | Alma & Jonquieres Ry. Co. | 10/57-4/70; eliminated 4/74 |
| AJAX | Ajax Transportation Co., Inc. | Apr-38 |
| AJPX | North American Chemical | added 4/94; 7/2000 |
| AJR | Artemus-Jellico R.R. | 4/38-1/52 |
| AKC | Arkansas Central R.R. Co. | 23-Jul |
| AKDN | Acadiana Ry. Co. | 1/94-7/2000 |
| AKFX | AKF Corp. | Jul-00 |
| AKGX | Andersen and Kindt Gas, Inc. | added 1/72; eliminated 7/74 |
| Polar Supply, Inc. | added 7/74; 1/75-1/80 | |
| AKMD | Arkansas Midland R.R. Co., Inc. | added 7/92; 1/94; added 4/95; eliminated 7/95 |
| Pinsly R.R. Co. | eliminated 7/95 | |
| Arkansas Midland R.R. Co., Inc. | eliminated 7/96 | |
| Pinsly R.R. Co. | added 7/96 | |
| Arkansas Midland R.R. Co., Inc. | added 4/97; 7/2000 | |
| AKMX | HELM Financial Corp. | added 7/97; 7/2000 |
| AKOX | Aycock-Lindsey Corp. | Apr-38 |
| AKZX | Akzo Chemie America | added 1/87; eliminated 4/89 |
| AKZO Chemicals Inc. | added 4/89; 1/94; eliminated 1/95 | |
| AKZO Nobel Chemicals, Inc. | added 1/95; 7/2000 | |
| AL | Almanor R.R. Co. | 1/75-1/80; eliminated 10/89; 1/94-7/2000 |
| ALAB | Alabama R.R. Co. | added 7/93; 1/94-7/2000 |
| ALAX | Alaska Asphalt Co. | eliminated 7/59 |
| Union Oil Co. of California | added 1/60; 4/61 | |
| Alabama Metalurgical Corp. | added 7/74; 1/75-1/80; eliminated 1/82 | |
| Cain Chemical Inc. | added 4/88; eliminated 1/90 | |
| Oxy Petrochemicals Inc. | added 1/90; eliminated 7/90 | |
| Occidental Chemical Corp., Alathon Polymers Division | added 7/90; eliminated 1/92 | |
| Occidental Chemical Corp. | added 1/92; 1/94; eliminated 10/95 | |
| Lyondell Petrochemical Co. | added 4/96; eliminated 4/98 | |
| Equistar Chemicals, LP | added 4/98; 7/2000 | |
| ALBX | Albert City Elevator | added 4/80; eliminated 10/89 |
| ALCX | Aluminum Co. of Canada, Ltd. | 4/38-1/80; eliminated 5/83 |
| Alcan Smelters and Chemicals, Ltd. | added 4/92; 1/94-7/2000 | |
| ALEX | Agri-Leasit | added 7/80; eliminated 4/84 |
| AGRI Financial Services, Inc. | 1/94; eliminated 10/95 | |
| AGRI Industries | added 10/95; eliminated 10/99; 7/2000 | |
| ALFX | Allied Foods | 4/61-7/65; eliminated 1/66 |
| ALJX | Alumina Products of Jamaica | added 10/68; eliminated 4/69 |
| ALLX | Allied Chlorine & Chemical Products, Inc. | added 1/67; eliminated 7/69 |
| Universal Packaging Corp. | added 7/69; 4/70-1/75 | |
| Alliance Machine Co. | added 4/85; eliminated 7/89; added 1/93; 1/94; eliminated 4/96; added 10/96; eliminated 4/97; 7/2000 | |
| A&LM | Arkansas & Louisiana Missouri Ry. Co. | 23-Jul |
| ALM | Arkansas & Louisiana Missouri Ry. Co. | 4/38-1/80; eliminated 4/92 |
| Arkansas Louisiana & Mississippi R.R. Co. | added 4/92; 1/94-7/2000 | |
| ALMX | Transcisco Leasing Co. | added 7/94; eliminated 7/97 |
| Trinity Rail Management, Inc. | added 7/97; 7/2000 | |
| ALNX | Alberta Government | added 1/81; 1/94-7/2000 |
| ALOX | Alberta Linseed Oil Co., Ltd. | 4/38-10/57; eliminated 10/59; added 4/61; 4/61-7/65; eliminated 7/65 |
| ALPX | Allen Packing Co., A Division of Food Fair Stores, Inc. | added 7/67; 4/70-1/80; eliminated 4/80 |
| Alberta Government | added 1/81; 1/94-7/2000 | |
| ALQS | Aliquippa and Southern R.R. Co. | 1/75-7/2000 |
| ALRX | A&R Leasing, L.L.C. | added 1/2001 |
| AL&S | Alton & Southern R.R. | 7/23-10/66 |
| ALS | (AL&S) Alton & Southern R.R. | Apr-70 |
| Alton and Southern Ry. Co. | 1/75-7/2000 | |
| ALSX | Albis Canada, Inc. | added 7/89; eliminated 4/93; 1/94; added 10/96; eliminated 4/97; 7/2000 |
| ALTX | Southern Illinois Railcar Co. | added 10/94; 7/2000 |
| ALU | Alcolu R.R. Co. | 23-Jul |
| ALUX | Alumax of South Carolina, Inc. | added 7/80; 1/94-7/2000 |
| ALWX | North American Car Corp. | added 10/70; 1/75-1/80 |
| General Electric Railcar Services Corp. | eliminated 10/88 | |
| ALY | Allegheny R.R. Co. | eliminated 1/93 |
| Allegheny & Eastern R.R., Inc. | added 1/93; 1/94-7/2000 | |
| AM | Arkansas & Missouri R.R. Co. | added 10/86; 1/94-7/2000 |
| AMAX | AMAX Coal Co., a Division of AMAX, Inc. | added 10/74; 1/75-1/80; eliminated 7/88 |
| AMAX Coal Co. | added 7/88; 1/94; eliminated 7/97; 7/2000 | |
| AMBX | Amherst Barge Co. | added 1/60 |
| Amherst Industries, Inc. | 4/61-1/80; eliminated 10/90 | |
| American Boiler Works, Inc. | Jul-00 | |
| AMC | Amador Central R.R. Co. | 1/75-1/94; eliminated 7/97 |
| Arkansas Louisiana & Mississippi R.R. Co. | added 7/97; 7/2000 | |
| AMCX | Amoco Chemicals Corp. | added 4/68; 4/70-1/80 |
| Amoco Chemical Co. | Jan-94 | |
| BP Amoco Chemical Co. | added 7/99 | |
| BP Amoco Chemical Co., Chemical Division | Jul-00 | |
| AMEX | Albamex | added 10/81; eliminated 4/88; 1/94 |
| AMFX | Aberfoyle Manufacturing Co. | Apr-38 |
| AMGX | AMG Resources Corp. | added 7/88; 1/94-7/2000 |
| AMHR | Amherst Industries, Inc. | added 10/82; eliminated 7/84 |
| Landisville R.R., Inc. | added 7/84; 1/94-7/2000 | |
| AMIX | Apollo Metals, Inc. | 4/70-1/75; eliminated 7/79 |
| Railcar Leasing Specialists, Inc. | added 1/93; 1/94-7/2000 | |
| AMLX | American Railcar Co. | added 1/96; added 4/96; eliminated 1/98; 7/2000 |
| AMMX | American Minerals, Inc. | added 10/68; eliminated 10/69 |
| Cyprus Industrial Minerals Co. | eliminated 1/90 | |
| Kentucky-Tennessee Clay Co. | added 7/90; 1/94-7/2000 | |
| AMNX | American Railcar Leasing Partners | Jul-00 |
| AMOX | Mexican Petroleum Corp. | Apr-38 |
| American Oil Co. | Apr-38 | |
| Alamo Tank Car Co. | Jan-52 | |
| American Oil Co. | 10/57-4/70 | |
| Amoco Oil Co. | 1/75-7/2000 | |
| AMPX | American Chemical Paint Co. | Apr-38 |
| Ark-Mo Plant Food Co., Inc. | 1/52-10/57; added 7/58; 4/61-7/65; eliminated 10/65 | |
| North American Car Corp. | added 1/77; 1/80 | |
| General Electric Railcar Services Corp. | 1/94; eliminated 1/2000 | |
| General Electric Rail Services Corp. | added 1/2000; 7/2000 | |
| AMR | The Arcata and Mad River R.R. Co. | added 11/73; 1/75-1/80; eliminated 4/85 |
| AMRX | American Refrigerator Transit Co. | 1/52-10/66; eliminated 1/69; 4/70-1/80 |
| Ameropan Railcar Corp. | added 1/90; 1/94; eliminated 10/97 | |
| Consolidated Oil & Transportation Co., Inc. | added 10/97; 7/2000 | |
| AMSX | AllTrans Management Services Corp. | added 4/98; 7/2000 |
| AMTK | National R.R. Passenger Corp. NEC | 1/80-7/2000 |
| AMTX | American Refrigerator Transit Co. | 7/65-10/66; eliminated 4/67; 4/70 |
| AMWX | Amway Corp. | added 4/82; eliminated 1/88 |
| AN | Apalachicola Northern R.R. Co. | 7/23-7/2000 |
| ANAX | Anaconda Copper Mining Co. | Jan-52 |
| The Anaconda Co. | 10/57; eliminated 10/60 | |
| Excel Railcar Corp. | added 7/82; eliminated 7/89 | |
| EXCEL Transnational, Inc. | added 7/89; 1/94; eliminated 4/95 | |
| EXCEL Railcar Corp. | added 4/95; eliminated 7/97 | |
| General Electric Railcar Services Corp. | added 7/97; eliminated 1/2000 | |
| General Electric Rail Services Corp. | added 1/2000; 7/2000 | |
| ANBX | Anbel Corp. | Jan-94 |
| ANC | Atlantic & North Carolina R.R. | Apr-38 |
| ANCX | American Can Co. | added 10/69; 4/70-1/75; eliminated 7/75 |
| American Norit Co., Inc. | 1/94; eliminated 4/95 | |
| Norit Americas Inc. | added 4/95; 7/2000 | |
| ANDX | Andesite Rock Co. | Jul-00 |
| ANGX | Arkansas Fuel Oil Co. | 4/38-1/52 |
| Arkansas Fuel Oil Corp. | Oct-57 | |
| ANKX | A&K R.R. Materials, Inc. | 1/94-7/2000 |
| AN&N | Anthony & Northern Ry. Co. | 23-Jul |
| ANPX | Anchor Petroleum Co. | 1/52-10/57; eliminated 4/61 |
| Mobil Oil Co., a Division of Socony Mobil Oil Co., Inc. | added 4/61; 4/61 | |
| ANR | Angelina & Neches River R.R. Co. | 1/75-7/2000 |
| ANSX | Ansco Investment Co. | Jul-00 |
| AOCX | Aluminum Ore Co. | 4/38-1/52 |
| Aluminum Co. of America | 10/57-7/2000 | |
| AOIX | Ashland Petroleum Co., Division of Ashland Oil, Inc. | added 4/95; eliminated 1/99 |
| Marathon Ashland Petroleum LLC | added 1/99; 7/2000 | |
| AOK | Arkansas-Oklahoma R.R., Inc. | added 7/96; 7/2000 |
| AOLX | American Oak Leather Co. | Apr-38 |
| AORX | Athens Fuel & Refining Co., Inc. | Jan-52 |
| AOUX | Alberta & Orient Glycol Co. Ltd. | added 10/94; 7/2000 |
| AOX | Associated Oil Co. (Tide Water Associated Oil Co.) | Apr-38 |
| Tidewater Oil Co. | 1/52-10/66; eliminated 7/67 | |
| APA | Apache Ry. Co. | 1/75-7/2000 |
| APAX | West Penn Power Co. | 1/80-1/94; eliminated 7/95 |
| Cementos Apasco S.A. de C.V. | Jul-00 | |
| APCX | Atlas Powder Co. | 4/38-4/61 |
| Atlas Chemical Industries, Inc. | 7/65-4/70; reporting marks changed to ICIX 4/72; eliminated 4/72 | |
| ICI America Inc. | added 4/72 | |
| ICI United States Inc. | 1/75-1/80 | |
| Allied Products Co. | added 4/81; eliminated 1/90 | |
| Allied Lime Co. | added 1/90; 1/94; eliminated 10/95; added 10/96; 7/2000 | |
| APD | Albany Port District | 1/75-7/2000 |
| APEX | Apex Oil Co. | Apr-38 |
| Apex Oil Co. (Chas. W. Mintz) | 1/52-10/57 | |
| Apex Oil Co. | eliminated 7/60 | |
| Apex Tank Car Line | 4/61-7/2000 | |
| APHX | Apache Powder Co. | 4/38-1/52; eliminated 4/54 |
| Air Products Polymers, L.P. | added 1/99; 7/2000 | |
| APIX | The Commonwealth Plan, Inc. | added 7/67; 4/70-7/2000 |
| APLX | American President Lines, Ltd. | added 7/80; eliminated 10/82; added 10/84; eliminated 7/86 |
| American President Intermodal Co., Ltd. | added 7/86; 1/94; eliminated 4/95 | |
| APL Land Transport Services, Inc. | added 4/95; 7/2000; eliminated 10/2000 | |
| APMX | American Potash & Chemical Corp. | 4/61-4/70; reporting marks changed to KMCX 1/71 |
| Air Products Manufacturing Co. | 1/94-7/2000 | |
| APNC | Appanoose County Community R.R., Inc. | added 1/85; 1/94-7/2000 |
| APOX | Kanotex Refining Co. | eliminated 10/53 |
| Anderson-Pritchard Oil Corp. | added 10/53; 10/57-4/61 | |
| Apco Oil Corp. | 7/65-4/70; eliminated 1/74 | |
| Alabama Power Co. | added 4/98; eliminated 7/99; 7/2000 | |
| APPX | Merchants Despatch Transportation Corp. | 1/52-10/66; eliminated 7/67 |
| APRX | Air Products and Chemicals, Inc. | added 1/75; 1/75-7/2000 |
| APSX | Arizona Public Service Co. | Jul-00 |
| APTX | Acme Petroleum Co. | Apr-38 |
| American Petrofina Co. of Texas | added 10/58; 4/61-1/75; eliminated 1/78 | |
| Air Products and Chemicals, Inc. | added 1/91; 1/94-7/2000 | |
| APWX | Appalachian Power Co. | added 10/74; 1/75-7/2000 |
| APX | The Albro Packing Co. | 1/52-10/57; eliminated 7/58 |
| APXX | Alberta Prairie Rail Excursions | 1/94-7/2000 |
| APYX | American Polymer Corp. | added 10/53 |
| AQCX | Aqua-Chem, Inc., Cleaver Brooks Division | added 1/69; 4/70-7/2000 |
| AR | Aberdeen and Rockfish R.R. Co. | 1/75; added 7/78; 1/80-7/2000 |
| ARA | Arcade & Attica R.R. Corp. | 4/70; eliminated 11/73; 1/75-7/2000 |
| ARC | Alexander R.R. Co. | 1/75-7/2000 |
| ARCX | Alaska Rail Car Co. | added 7/64; 7/65-1/80; eliminated 7/92 |
| ARCX | Arizona Rail Car Inc. | 1/94-7/2000 |
| ARDP | Missouri Pacific R.R. Co. | Jan-75 |
| Doniphan, Kensett & Searcy Ry. | eliminated 1/79; 1/80 | |
| Missouri Pacific System | 1/94; eliminated 4/97 | |
| Union Pacific R.R. Co. | added 4/97; 7/2000 | |
| ARDX | American Reduction Co. of Pittsburgh | Apr-38 |
| American Refrigerator Transit Co. | 10/57; eliminated 4/61 | |
| ARE | A. & R. Line, Inc. | Jul-00 |
| AREX | Aeropres Corp. | added 10/74; 1/75-7/2000 |
| ARGX | Associated Railcar, Inc. | added 10/84; eliminated 1/85; 1/94; eliminated 4/96; 7/2000 |
| ARHX | Arch Mineral Corp. | added 7/90; 1/94; eliminated 10/97; 7/2000 |
| ARIX | Allegany Refiners, Inc. | Apr-38 |
| Airco Industrial Gases Division, Air Reduction Co., Inc. | added 10/67 | |
| Airco Industrial Gases, Division of Air Reduction Co. Inc. | 4/70; eliminated 1/72 | |
| Airco Industrial Gases, A Division of Airco, Inc. | added 1/72; 1/75-1/94 | |
| BOC Gases, a Division of the BOC Group, Inc. | eliminated 1/2000 | |
| General Electric Rail Services Corp. | added 1/2000; 7/2000 | |
| ARKX | The Arkansas Co. | Jan-52 |
| ARLX | Armour Car Lines (Armour Refrigerator Line) | 4/38-7/65 |
| Armour Refrigerator Line | Oct-66 | |
| Armour Car Lines | eliminated 7/69 | |
| Armour and Co. | added 7/69; 4/70-1/75; eliminated 1/78 | |
| ARMH | Missouri Pacific R.R. Co. | added 1/75; 1/75; eliminated 7/75 |
| Texas-New Mexico Ry. Co. | added 7/75 | |
| Doniphan, Kensett & Searcy Ry. | Jan-80 | |
| Missouri Pacific System | 1/94; eliminated 4/97 | |
| Union Pacific R.R. Co. | added 4/97; 7/2000 | |
| ARMN | Missouri Pacific R.R. Co. | added 11/73; 1/75-1/80 |
| Missouri Pacific System | 1/94; eliminated 4/97 | |
| Union Pacific R.R. Co. | Jul-00 | |
| ARMX | Armco Steel Corp. | 1/52-10/57; eliminated 1/59 |
| American Rail & Marine Corp. | added 4/84; eliminated 4/87; 1/94-7/2000 | |
| ARN | Albert RailNet, Inc. | Jul-00 |
| AROX | Arro Oil & Refining Co. | Apr-38 |
| General American Transportation Corp. | 1/52-7/65 | |
| Air Reduction Co., Inc. (General American Transportation Corp.) | Oct-66 | |
| General American Transportation Corp. | 4/70-1/80; eliminated 1/88; 1/94-7/2000 | |
| ARPX | A.R.P. Leasing Corp. | added 4/71; 1/75 |
| ARCO Petroleum Co.-Division of Atlantic Richfield Co. | added 1/80; 1/80; eliminated 4/80 | |
| Arco Petroleum Products Co., Division of Atlantic Richfield Co. | added 4/80; eliminated 1/89 | |
| Arco Products Co., Division of Atlantic Richfield Co. | added 1/89; 1/94 | |
| Arco Products Co. | eliminated 7/2000 | |
| Amoco Oil Co. | added 7/2000; 7/2000 | |
| ARR | Alaska R.R. | 7/65-1/80; eliminated 4/85 |
| Alaska R.R. Corp. | added 4/85; 1/94-7/2000 | |
| ARRG | Altra R.R. Co. | eliminated 10/89 |
| ARRX | Arco Coal Co.--Division of Atlantic Richfield Co. | added 7/79; 1/80; eliminated 7/82 |
| Anaconda Minerals Co.--Division of Atlantic Richfield Co. | added 7/82; eliminated 4/88 | |
| ARSX | Shippers' Car Line Corp. | eliminated 7/56 |
| Shippers' Car Line Division of ACF Industries Inc. | added 7/56; 10/57-1/80 | |
| Aristech Chemical Corp. | 1/94-7/2000 | |
| ART | American Refrigerator Transit Co. | 4/38-7/2000 |
| ARTX | American Refrigerator Transit Co. | Apr-38 |
| ARW | The Arkansas Western Ry. Co. | 1/75-7/2000 |
| ARWX | Alabama River Woodlands, Inc. | added 4/81; 1/94-7/2000 |
| ARZC | Arizona & California R.R. Co. | added 10/91; 1/94; added 4/94; 7/2000 |
| AS | Abilene & Southern Ry. Co. | 10/57-1/75 |
| A&S | Abilene & Southern Ry. Co. | 7/23-1/52 |
| Missouri Pacific System | eliminated 1/79 | |
| A&SA | Atlanta & St. Andrews Bay Ry. | 7/23-1/52 |
| ASAB | Atlanta & Saint Andrews Bay Ry. Co. | 10/57-1/94; eliminated 4/94 |
| The Bay Line R.R., L.L.C. | added 4/94; 7/2000 | |
| ASBX | American Synthetic Rubber Corp. | added 4/61; 4/61-4/70; eliminated 7/74 |
| ASCX | Almalgamated Sugar Co. | 4/38-10/57; eliminated 1/59 |
| The Algoma Steel Co., Ltd. | added 1/85 | |
| The Algoma Steel Corp., Ltd. | eliminated 10/87 | |
| Armco Steel Co., L.P. | added 7/91; 1/94; eliminated 10/94; 7/2000 | |
| ASDA | Asbestos & Danville | 1/75-1/80 |
| ASDX | Allied Services--A Division of Allied Equities Corp. | 1/75-1/80 |
| ASEX | Armour Stock Express (Armour Car Lines) | Apr-38 |
| General American Transportation Corp. | Jan-52 | |
| Armour Car Lines | eliminated 10/58 | |
| General American Transportation Corp. | 10/57; added 10/58; 4/61-7/65; eliminated 1/70 | |
| Armour Stock Express (General American Transportation Corp.) | Oct-66 | |
| ASFX | American Steel Foundries -- temporary expiring 31Dec52 | Jan-52 |
| American Steel Foundries -- temporary expiring 10Jan58 | Oct-57 | |
| American Steel Foundries -- temporary expiring 15Oct61 | Apr-61 | |
| American Steel Foundries, Inc. | 7/65-10/66 | |
| American Steel Foundries, Inc. -- temporary expiring 1Apr71 | 4/70; eliminated 10/72 | |
| American Steel Foundries, Inc. (Marks temporarily assigned for other than tank cars; marks expire 1Apr75) | Jan-75 | |
| American Steel Foundries, Inc. (Marks temporarily assigned for other than tank cars; marks expire 1Jan81) | Jan-80 | |
| ASGX | Ash Grove Cement Co. | Jul-00 |
| ASHX | General American Transportation Corp. | added 1/68; 4/70-1/80; eliminated 1/88; 1/94 |
| American Soda, L.L.P. | added 1/2001 | |
| ASIX | American Steel Car Lines, Inc. (Inland Car Lines, Inc.) | Apr-38 |
| ASLX | Algoma Steamships, Ltd. | added 1/79; 1/80; eliminated 10/84 |
| ASML | The Atlanta, Stone Mountain & Lithonia Ry. Co. | 1/75-1/80 |
| ASMX | Asarco Mexicana, S.A. | added 10/65; 10/66-1/75; eliminated 7/75 |
| Industria Minera Mexico, S.A. (reporting marks being changed to IMMX) | added 7/75 | |
| ASR | Allegheny Southern R.R., Inc. | Jul-00 |
| ASRW | Allegheny Southern Ry. | added 1/83; eliminated 1/85 |
| ASRX | American Sugar Refining Co. | 4/38-4/61 |
| American Sugar Co. | 7/65-4/70 | |
| Amstar Corp. | 1/75-1/80; eliminated 4/89 | |
| Amstar Sugar Co. | added 4/89; eliminated 10/92 | |
| Domino Sugar Corp. | added 10/92; 1/94-7/2000 | |
| ASRY | Ashland Ry., Inc. | added 7/86; eliminated 10/87; eliminated 1/92; added 1/94; 7/2000 |
| ASTX | American Smelting and Refining Co. | added 1/74; 1/75 |
| Asarco Inc. | 1/80-7/2000 | |
| ASWX | American Steel & Wire Co. | Apr-38 |
| ASX | American Smelting & Refining Co. | 4/38-7/65; eliminated 4/66 |
| ASYX | Avondale Shipyards, Inc. | added 1/75; 1/75-1/80; eliminated 1/85 |
| ATBX | Lithcote Corp. | Apr-70 |
| ATCO | Arnold Transit | 1/75-1/80 |
| ATCX | American Tar Co. | Apr-38 |
| Ace Tank Car Co. | 1/52-10/57; eliminated 7/60 | |
| Aiple Towing Co. | added 10/70; eliminated 4/73 | |
| Southern Illinois Railcar Co. | added 10/94; 7/2000 | |
| ATDX | American Tar & Chemical Co. | Apr-38 |
| ATEX | Teas Extract Co. | 4/38-1/52; eliminated 7/56 |
| Asplundh Tree Expert Co., R.R. Division | 1/94-7/2000 | |
| ATGX | ATEL Leasing Corp. | added 10/96; 7/2000 |
| ATLT | AT&L R.R. Co. | 1/94-7/2000; eliminated 4/2001 |
| ATLX | Armour Tank Line (Armour Car Lines) | Apr-38 |
| General American Transportation Corp. | 1/52-4/61 | |
| Armour Car Lines | eliminated 10/58 | |
| General American Transportation Corp. | added 10/58; 7/65 | |
| Armour Tank Line (General American Transportation Corp.) | Oct-66 | |
| General American Transportation Corp. | 4/70; eliminated 7/73 | |
| Atlas Machine & Iron Works, Inc. | added 7/80; eliminated 1/86; 1/94-7/2000 | |
| ATMX | U.S. Atomic Energy Commission | 1/52-4/61; added 1/65; 7/65; eliminated 7/65; 10/66; eliminated 1/68 |
| U.S. Atomic Energy Commission, Albequerque Operations Office | Apr-70 | |
| U.S. Atomic Energy Commission, Paducah, Kentucky | eliminated 4/73 | |
| U.S. Atomic Energy Commission, Albequerque Operations Office | 1/75; eliminated 4/75 | |
| United States Energy Research and Development Administration, Albequerque Operations Office | added 4/75; eliminated 1/78 | |
| U.S. Dept. of Energy, Albuquerque Operations Office | added 1/78; 1/80-1/94; eliminated 10/97; 7/2000 | |
| ATPX | American Tar Products Co., Inc. (Koppers Co.) | Apr-38 |
| ATRW | Anthracite Ry., Inc. | added 10/83; eliminated 10/89 |
| ATSF | Atchison, Topeka & Santa Fe Ry. | 4/38-1/94; eliminated 7/97 |
| The Burlington Northern Santa Fe Ry. Co. | added 7/97; 7/2000 | |
| ATSU | The Atchison, Topeka and Santa Fe Ry. Co. | added 4/75 |
| ATSX | Atlantic Sugar Refineries Co. Ltd. | 10/57-4/70; eliminated 10/71 |
| ATTX | American Turpentine & Tar Co., Ltd. | 4/38-10/57; eliminated 10/60 |
| Trailer Train Co. | Jul-65 | |
| Trailer Train Co. (FC flats equipped with 2 continuous tie-down anchor bars applied to centre sills and 2 continuous side tie-down rails. Cars are not equipped with jacks, chains, hitch and safety chains) | 10/66-10/68 | |
| Trailer Train Co. | Apr-70 | |
| Trailer Train Co. (flat cars equipped with 2 continuous tie-down loops on centre sills, continuous tie-down rails on each side and bridge plates. Not equipped with hitches, chains, jacks, etc.) | 1/75-1/80 | |
| Trailer Train Co. | eliminated 1/92 | |
| TTX Co. | added 1/92 | |
| TTX Co. (flat cars equipped with 2 continuous tie-down loops on centre sills, continuous tie-down rails on each side. Not equipped with hitches, chains, jacks, etc.) | Jan-94 | |
| TTX Co. (60 ft. COFC flatcars, equipped with spark shields and container latches, capable of carrying 3-20 ft. containers, or 1-40 ft. and 1-20 ft. container, fully loaded to a maximum gross weight per car (containers and lading) of 159,000 lbs.) | Jul-00 | |
| ATW | Atlantic and Western Ry. Co. | 1/75-1/80; eliminated 1/92 |
| ATW Ry., L.P. | added 1/92; eliminated 4/92 | |
| Atlantic and Western Ry., L.P. | added 4/92; 1/94-7/2000 | |
| AUG | Augusta R.R. Co. | 1/75-1/80; added 7/81; eliminated 10/86; 1/94-7/2000 |
| AUNW | Austin R.R. (Austin & Northwestern R.R. Co.) | added 1/87; 1/94; eliminated 7/96 |
| AUPX | Austin Powder Co. | 4/38-4/70; eliminated 1/75 |
| AUS | Augusta Southern R.R. | 23-Jul |
| Augusta & Summerville R.R. Co. | 1/75-1/80 | |
| A&V | The Alabama and Vicksburg Ry. Co. | 23-Jul |
| AVCX | Alton Vinegar Co. | Apr-38 |
| American Viscose Corp. | 10/57-4/61 | |
| FMC Corp., American Viscose Division | Jul-65 | |
| FMC Corp. | eliminated 10/66 | |
| AVCO Aerostructures Division | added 4/71; 1/75-1/80; eliminated 10/89 | |
| AVDX | FMC Corp. | added 10/66; 10/66 |
| FMC Corp., American Viscose Division | 4/70-1/75 | |
| FMC Corp. | eliminated 1/79 | |
| AVL | Aroostook Valley R.R. Co. | 7/23-1/80 |
| General Electric Railcar Services Corp. | Jan-94 | |
| Aroostook Valley R.R. Co. | eliminated 10/94; 7/2000 | |
| AVR | Allegheny Valley R.R. Co. | Jul-00 |
| AVX | American Viscose Corp. | Jan-52 |
| A&W | Alexandria & Western Ry. Co. | 23-Jul |
| AW | Ahnapee & Western Ry. Co. | 4/38-4/70 |
| AWCX | Airco Welding Products Division, Air Reduction Co., Inc. | added 10/71 |
| Airco Welding Products, a Division of Airco, Inc. | 1/75-1/80; eliminated 7/86; 1/94-7/2000 | |
| AWDX | Atlantic of New York, Inc. | added 10/96; eliminated 7/98; 7/2000 |
| AWIX | Albright & Wilson Inc. | added 7/86; eliminated 1/89 |
| Albright & Wilson Americas Inc. | added 1/89; eliminated 4/93; 1/94; added 4/97; eliminated 1/2000; 7/2000 | |
| AWLX | Laytham Foundry, Inc. | 7/65; eliminated 4/66 |
| A&WP | Atlanta & West Point R.R. Co. | 4/38-10/66 |
| AWP | (A&WP) Atlanta & West Point R.R. Co. | Apr-70 |
| Atlanta & West Point R.R. Co. | 1/75-1/80; eliminated 1/83 | |
| Seaboard System R.R., Inc. | added 1/83; eliminated 7/87 | |
| CSX Transportation, Inc. | added 7/87; 1/94-7/2000 | |
| AWSX | Alan Wood Steel Co. | 1/52; eliminated 4/54 |
| AWW | Algiers, Winslow and Western Ry. Co. | 1/75-1/94; eliminated 4/98; 7/2000 |
| AYCX | R.L. Aycock Co. | Apr-38 |
| The Aycock Co. | 7/65; eliminated 10/65 | |
| AYRX | Arms-Yager Railway Car Co. | Apr-38 |
| AYSS | Allegheny & South Side | 1/75-1/80 |
| AZCR | Arizona Central R.R., Inc. | added 7/89; 1/94-7/2000 |
| AZCX | American Zinc & Chemical Co. | Apr-38 |
| Azcon Corp. | added 10/96; eliminated 7/98; 7/2000 | |
| AZER | Arizona Eastern Ry. Co. | added 1/89; 1/94; eliminated 7/94; 7/2000 |
| AZEX | Arizona Electric Power Cooperative, Inc. | added 4/78; 1/80-7/2000 |
| AZLX | American Zinc Co. of Illinois | added 4/65 |
| American Zinc, Lead and Smelting Co. | Jul-65 | |
| American Zinc Co. of Illinois | 10/66; eliminated 4/67 | |
| American Zinc Co. | added 4/67; 4/70; eliminated 10/70 | |
| AZMX | Arizona Railway Museum | Jul-00 |
| AZS | Arizona Southern R.R. Co. | 23-Jul |
| AZX | American Zinc Co. of Illinois | 1/52-10/57; eliminated 7/59 |