| Abbreviation | Definition |
|---|---|
| ANAX | The Anaconda Company (GE Rail Services Corporation) |
| ANBX | Anbel Corporation |
| ANC | Atlantic and North Carolina Railroad |
| ANCX | American Norit Company |
| ANCX | Norit Americas Incorporated |
| ANDX | Andesite Rock |
| ANDX | Andesite Rock Company |
| ANIX | Associacion National de la Industria Quimca, A.C. |
| ANKX | A and K Railroad Materials |
| ANKX | A and K Railroad Materials Incorporated |
| ANR | Angelina and Neches River Railroad |
| ANSX | Ansco Investment |
| ANSX | Ansco Investment Company |
| ANY | Athabasca Northern Railway |
| ANYU | One Way Lease Inc. |
| AO | Appalachian and Ohio Railroad |
| AOCU | Associated Octel |
| AOCX | Aluminum Company of America |
| AOCX | Aluminum of America (Alcoa) |
| AOEX | American Orient Express Railway |