| Abbreviation | Definition |
|---|---|
| RUDX | Ruddy Tank Car |
| RUDX | Ruddy Tank Car Company |
| RUSX | First Union Rail |
| RUSX | US Rail Services |
| RUT | Rutland Railroad (Vermont Railway) |
| RUT | Vermont Railway Incorporated |
| RV | Rahway Valley Railroad (Morristown & Erie) |
| RVCX | Richter Vinegar Corporation |
| RVE | Rail vehicle enhancements |
| RVG | Rail Vertical Grip |
| RVIX | Rail Venture |
| RVLX | Reinhardt Vinegar |
| RVLZ | TAL International |
| RVLZ | Transamerica Leasing Incorporated |
| RVNL | Rail Vikas Nigam Limited |
| RVPR | Riverport Railroad |
| RVSC | Rio Valley Switching |
| RVSC | Rio Valley Switching Company |
| RVTG | Rail Veyor Technologies Global |
| RWCE | Railway Written Communication Exercise |