| Abbreviation | Definition |
|---|---|
| RGEX | Royal Gorge Industries |
| RGEX | Royal Gorge Industries, LLC |
| RGIX | Republic Gas and Utilities Corporation |
| RGLD | RGL Distribution Center, Inc. |
| RGRX | Rio Grande Railcar |
| RGRX | Rio Grande Railcar Company Incorporated |
| RGS | Rio Grande Southern Railroad |
| RGTE | Reichenberg Gablonz Tannwalder Eisenbahn |
| RGTU | Denver and Rio Grande Western Railroad (Union Pacific Railroad) |
| RGTU | Denver and Rio Grande Western Railroad Company |
| RGTX | Denver and Rio Grande Western Railroad (Residco) |
| RGTX | Residco |
| RGTZ | Denver and Rio Grande Western Railroad (Union Pacific Railroad) |
| RGTZ | Union Pacific Railroad Company |
| RGV | Rail Guided Vehicle |
| RGW | Rio Grande Western Railway (Union Pacific Railroad) |
| RGWZ | Rio Grande Western Railway (TAL International) |
| RGWZ | Transamerica Leasing, Incorporated |
| RH | Rail Head |
| RHAX | Sulphur Sales |