| Abbreviation | Definition |
|---|---|
| GANG | Georgia Association of Narrow Gaugers |
| GANO | Georgia Northern Railway |
| GANO | Georgia Northern Railway Company |
| GAOX | GATX Corporation |
| GAPX | Georgia Gulf Corporation - Plaquemine Division |
| GAPX | Georgia-Pacific Corporation Plaquemine Division |
| GARX | General American Marks Company |
| GARX | General American Transportation Corporation (GATX de Mexico de CV) |
| GASC | Georgia, Ashburn, Sylvester & Camilla Railroad |
| GASX | General American Marks (GATX Corporation) |
| GASX | General American Marks Company |
| GATU | Gateway Container Leasing |
| GATU | General American Transportation Corporation |
| GATX | GATX Corporation |
| GATX | General American Marks Company |
| GAUU | Gauthier On Site Storage & Gauthiers Oilfield Rent |
| GAUX | General American Transportation Corporation (GATX) |
| GAYX | General American Transportation Corporation (GATX) |
| GBKU | TAM International |
| GBLE | Georgian Bay & Lake Erie Railway |