Perhaps you were looking for one of these?

• AA Ann Arbor
• AACX State of Alaska, Division of Agriculture
• AAMX ACFA Arrendadora de Carros de Ferrocarril S.A.
• AAR Association of American Railroads
• AARX Association of American Railroads
• AB Akron and Barberton Cluster Railway Company
• ABA Atlanta, Birmingham & Atlantic Railroad Company
• ABB Akron and Barberton Belt Railroad Company
• ABC Atlanta Birmingham & Coast
• ABC-NACO ABC-NACO
• ABCX Alabama Byproducts Corporation
• ABFZ Arkansas Best Freight
• ABLX American Refrigerator Transit Co
• ABOX TTX Company
• ABP Aberdeen & Briar Patch
• ABRX AB Rail Investments Incorporated
• ABSX ALBERT BROS., INC.
• ABWX Asea Brown Boveri Incorporated
• ABYX Albany Recycling Services, Inc.
• AC Algoma Central
• ACAX Honeywell International Incorporated
• ACCU Aboitiz Shipping Corp
• ACCX Consolidation Coal Company
• ACDX Honeywell International Incorporated
• ACHD Atlantic City Harley Davidson
• ACIS Algoma Central Railway Incorporated
• ACIX Great Lakes Chemical Corporation
• ACJR Ashtabula Carson Jefferson Railroad Company
• ACLU Atlantic Container Line Limited
• ACLX American Car Line Company
• ACLZ Atlantic Container Line Ab
• ACMX Voith Hydro Incorporated
• ACN ACN
• ACPX Union Tank Car Company
• ACPZ American Concrete Products Company
• ACRX Elementis Chromium LP
• ACSX Honeywell International Incorporated
• ACSZ American Carrier Equipment
• ACTC Atlantic City Transit Company
• ACTS ACTS - Holland
• ACTX Honeywell International Incorporated
• ACWR Aberdeen, Carolina & Western
• ACWX CAROLINA LEASING & CONTRACTING CORPORATION
• ACY Akron, Canton & Youngstown
• AD Atlantic & Danville
• ADBF Adrian and Blissfield Rail Road Company
• ADLX Adler Funding LLC
• ADMN ADMN
• ADMX ADM Transportation Company
• ADN Ashley Drew & Northern