| Abbreviation | Designation | |
|---|---|---|
| k | Kiosk / Bistro (German) | classification |
| K | Schmalspurwagen (German) | classification |
| SE-K | Blekinge, Blekinge län (Swedish) | country code |
| AT-K | Kärnten, Land Kärnten (German) Carinthia | country code |
| K | Köln Hbf, Stadt Köln (German) | fare point / vehicle registration plate |
| K | Katrineholm C (Swedish) | station code |
| K | RB Köln, Regionalbereich Köln (German) RB Cologne | railway administration |
| K | Koch (German) Cook | profession |
| 15 / K | BD Köln (1953–1994), Bundesbahndirektion Köln (German) BD Cologne | railway administration |