| Abbreviation | Definition |
|---|---|
| RWCX | R W C Incorporated |
| RWCX | RWC Inc. |
| RWF | Rail Wheel Factory |
| RWF | Rail Wheel Factory, India |
| RWI | Riley Whittle Incorporated |
| RWSX | Scherer Electric Generating Facility |
| RWTX | Railwest U S Incorporated |
| RWTX | Railwest US |
| RWTZ | Satellite Intermodal Express |
| RWY | Railway |
| RXXZ | TIP Intermodal Services |
| RXXZ | Transamerica Leasing Incorporated |
| RYAN | RYAN Industries |
| RYCU | De Rycke Vloeitransport B.V. |
| RYCU | De Rycke Vloeitransport, B. V. |
| RYNX | RYAN Industries |
| RZ | Restricted Zone |
| SA | Norfolk Southern Railway Company |
| SA | Savannah and Atlanta Railroad (Central of Georgia Railroad) |
| SAFX | Safety-Kleen Corporation |