| Abbreviation | Definition |
|---|---|
| RSW | Rail Safety Week |
| RSWZ | TAL International |
| RSWZ | Transamerica Leasing Incorporated |
| RSYX | Refined Sugars |
| RSYX | Refined Sugars, Incorporated |
| RT | River Terminal Railway Company |
| RT | River Terminals Railway |
| RTC | Rail Tank Car |
| RTCX | Republic Tank Car Co. (Union Tank Car) |
| RTCX | Union Tank Car Company |
| RTCZ | Rocor Freight Services |
| RTDM | Rail Transport Demand Management |
| RTDX | Regional Transportation District, a railroad in Denver, Colorado |
| RTDZ | Regional Transportation District (Denver) |
| RTEX | Rail Trusts Equipment |
| RTEX | Rail Trusts Equipment Incorporated |
| RTIF | Rail to Truck Intermodal Facility |
| RTIX | RTI - Railroad Services |
| RTLX | Relco Nevada Corporation (Relco Tank Line Division) |
| RTLX | Relco Tank Line Incorporated |