| Abbreviation | Definition |
|---|---|
| RHB | RHaetischeBahn |
| RHBX | R. H. Bogle |
| RHCP | Railway Highway Crossings Program |
| RHK | RataHallintoKeskus |
| RHRX | Rahr Malting |
| RHRX | Rahr Malting Company |
| RHTT | Rail Head Treatment Trains |
| RI | Chicago, Rock Island and Pacific Railroad |
| RIA | Rail Industrial Access |
| RICU | Rinnen GMBH |
| RICU | Rinnen GMBH and CO KG Internationale Spedition |
| RICX | Rockwell International Corporation |
| RIDC | Rail Innovation and Development Centre |
| RIEF | Rail Industry Environment Forum |
| RIFA | Rail Industry Fire Association |
| RIIX | Reilly Industries |
| RIL | Rock Island Line |
| RILX | Garvey International Incorporated, Garvey Grain Division |
| RILX | Interail |
| RIMMS | Rail Infrastructure Maintenance Management System |