Acronym |
Definition |
| ACWR | Aberdeen, Carolina and Western Railway |
| ACWZ | Union Pacific Railroad Company |
| ACWZ | Chicago & North Western (Union Pacific Railroad) |
| ACXU | Atlantic Cargo Services AB |
| ACXU | Atlantic Cargo Services, AB |
| ACXX | Anderson Columbia Company Incorporated |
| ACXX | Anderson Columbia |
| ACY | Norfolk Southern Railway Company |
| ACY | Akron, Canton and Youngstown Railroad (Norfolk Southern Railway) |
| ACZX | A C Railroad Service (Norfolk Southern Railway) |
| AD | Atlantic and Danville Railway (Norfolk, Franklin and Danville Railway) |
| ADBF | Adrian and Blissfield Rail Road Company |
| ADBF | Adrian and Blissfield Railroad |
| ADCU | Flexi-Van Leasing Incorporated |
| ADCU | Flexi-Van Leasing |
| ADCX | Adolph Coors |
| ADIR | Adirondack Scenic Railroad |
| ADIR | Adirondack Railway |
| ADIX | Adirondack Railway Preservation Society |
| ADKU | AGA A/S |
| ADMX | ADM Transportation Company |
| ADMX | Archer Daniels Midland |
| ADN | Arkansas Louisiana and Mississippi Railroad Company |
| ADN | Ashley, Drew and Northern Railway (Arkansas, Louisiana and Mississippi Railroad) |
| ADRM | Additional Divisional Railway Manager |
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