| Abbreviation | Definition |
|---|---|
| ALAX | Equistar Chemicals LP |
| ALBERT | Automated Liberal Binarily Emulating Railroad Tacticians |
| ALBR | Albany Bridge Railroad |
| ALBX | Albert City Elevator |
| ALCX | Alcan Smelters and Chemicals (Allegheny Creative Energy Solutions) |
| ALCX | Alcan Smelters and Chemicals Limited |
| ALEU | Air Liquide Electronics U.S. |
| ALEX | AGRI Industries |
| ALGX | Amsterdam Leasing |
| ALIU | Aljoma Lumber |
| ALKX | Airlake Terminal Railway |
| ALLX | Alliance Machine |
| ALLX | Alliance Machine Company |
| ALLZ | Alliance Shippers |
| ALM | Arkansas Louisiana and Mississippi Railroad Company |
| ALM | Arkansas, Louisiana and Mississippi Railroad |
| ALMX | Ankeney Linseed Manufacturing (Trinity Rail Management) |
| ALMX | Trinity Rail Management Incorporated |
| ALNX | Alberta Government |
| ALPX | Alberta Government |