| Abbreviation | Definition |
|---|---|
| ALQS | Aliquippa and Southern Railroad |
| ALQS | Aliquippa and Southern Railroad Company |
| ALRX | A and R Leasing |
| ALS | Alton and Southern Railroad (Alton and Southern Railway) |
| ALS | Alton and Southern Railway Company |
| ALSX | Albis Canada |
| ALSX | Albis Canada Incorporated |
| ALT | Airlake Terminal Railway |
| ALTU | VTG Deutschland |
| ALTU | VTG Vereinigte Tanklage U Transportmittel GMBH |
| ALTX | Alter Trading (Southern Illinois Railcar) |
| ALTX | Southern Illinois Railcar Incorporated |
| ALU | Alcolu Railroad |
| ALUX | Alumax of South Carolina |
| ALUX | Alumax of South Carolina Incorporated |
| ALWX | GE Railcar Services Corporation |
| ALY | Allegheny and Eastern Railroad Incorporated |
| ALY | Allegheny Railroad (Allegheny and Eastern Railroad) |
| AM | Arkansas and Missouri Railroad |
| AM | Arkansas and Missouri Railroad Company |