| Abbreviation | Definition |
|---|---|
| GETZ | Transport International Pool Inc. |
| GETZ | Transport International Pool Incorporated |
| GEVO | General Electric Evolution Series locomotives |
| GEX | General Electric |
| GEX | General Electric Company |
| GEXR | Goderich-Exeter Railway (Genesee & Wyoming) |
| GEXR | Goderich-Exeter Railway Company Limited |
| GF | Gauge Fixing |
| GF | Georgia & Florida Railway (Norfolk Southern) |
| GF | Norfolk Southern Railway Company |
| GFAX | Gordon Fay Associates |
| GFAX | Gordon Fay Associates Incorporated |
| GFC | Grand Falls Central Railway |
| GFC | Grand Falls Central Railway Company Limited |
| GFCX | Glens Falls Lehigh Cement |
| GFCZ | General Foods Corporation |
| GFHX | Commercial Credit Capital Corporation |
| GFJX | Garret Railroad Car and Equipment |
| GFLX | Greenfield Logistics |
| GFR | Grand Forks Railway |