| Abbreviation | Definition |
|---|---|
| AEPX | American Electric Power Service |
| AEPX | American Electric Power Service Corporation |
| AER | Algoma Eastern Railway |
| AERC | Albany and Eastern Railroad |
| AERC | Albany and Eastern Railroad Company |
| AESX | A. E. Staley Manufacturing (GE Railcar Services Corporation) |
| AESX | General Electric Railcar Services Corporation |
| AEVX | AKZO Coatings |
| AEVX | AKZO Coatings Incorporated |
| AEX | The Andersons |
| AF | Alabama and Florida Railway |
| AF | Alabama and Florida Railway Company |
| AFCU | Afram Lines |
| AFCU | Afram Lines Incorporated |
| AFCX | Atel Capital Equipment Fund |
| AFCX | Atel Leasing Corporation |
| AFCZ | Afram Lines |
| AFCZ | Afram Lines Limited |
| AFEX | Farmers Elevator of Arthur, ND |
| AFFX | AFFCAR |