| Abbreviation | Definition |
|---|---|
| RTMX | General Electric Railcar Services Corporation |
| RTMX | Richmond Leasing |
| RTMZ | TIP Intermodal Services |
| RTMZ | Transamerica Leasing Incorporated |
| RTPX | Wheelabrator Coal Services (GE Rail Services) |
| RTPX | Wheelabrator Coal Services Company |
| RTR | Real Time Rail |
| RTRU | Road Trailer Rentals |
| RTRU | Road Trailer Rentals Incorporated |
| RTRX | Rocky Mountain Transportation Services |
| RTRZ | Road Trailer Rentals Limited |
| RTS | Rail Technical Services |
| RTS | Rapid Transit System |
| RTSX | Rail Transportation Services |
| RTSX | Rail Transportation Services Incorporated |
| RTTX | TTX Company |
| RTTX | TTX Corporation |
| RTTZ | Union Pacific Railroad |
| RTTZ | Union Pacific Railroad Company |
| RUBM | Rail and Universal Beam Mill |