| Abbreviation | Designation | |
|---|---|---|
| Frw | Fahrtrichtungswechsel (German) | rail transport operations |
| 66 / TJ | Tajikistan | country code |
| 66 / XPWW | Warszawa Wschod. (Polish) | station code |
| SWB 66 | SWB Bus und Bahn (Bad Honnef ↔ Bonn ↔ Siegburg) (German) | transportation line |