| Abbreviation | Definition |
|---|---|
| RSPX | Evans Railcar Leasing (GE Railcar Services) |
| RSPZ | TAL International (Union Pacific) |
| RSPZ | Transamerica Leasing Incorporated |
| RSR | Rochester and Southern Railroad |
| RSR | Rochester Southern Railroad |
| RSRP | Rail Safety Regulators Panel |
| RSRP | Rail Safety Regulators' Panel |
| RSRU | Norfolk Southern Railway Company |
| RSRZ | Norfolk Southern Railway |
| RSRZ | Norfolk Southern Railway Company |
| RSS | Rochester Subway (Rockdale, Sandow and Southern Railroad) |
| RSS | Rockdale Sandow and Southern Railroad Company |
| RSSB | Rail Safety and Standards Board |
| RSSI | Railway Systems Suppliers, Inc. |
| RSSM | Rail Security Sensitive Materials |
| RSSX | Railserve Inc. |
| RSTR | Rail Safety and Training Resources |
| RSTX | RSTX Inc. |
| RSUX | Riley Stoker Corporation |
| RSVX | Railserv Management Corp |