| Abbreviation | Designation | |
|---|---|---|
| r | Rapid-Bremse (German) | classification |
| R | Regio (German) | train category |
| R | REGIO (Polish) REGIO (Poland) | train category |
| R | RegioBus (German) | train category |
| R | Regional (Portuguese) | train category |
| R | Regionale (Italian) | train category |
| R | Regionalzug (German) | train category |
| R | rychlík (Czech) express train | train category |
| R | Regensburg Hbf, Stadt Regensburg (German) | fare point / vehicle registration plate |
| R | Rotebro (Swedish) | station code |
| R | RB Karlsruhe, Regionalbereich Karlsruhe (German) | railway administration |
| SE-R | Skaraborg, Skaraborgs län (Swedish) | country code |
| 14 / R | BD Karlsruhe (1953–1994), Bundesbahndirektion Karlsruhe (German) | railway administration |