| Abbreviation | Designation | |
|---|---|---|
| BÜ | Bahnübergang (German) | railway installation |
| Bu | Großraumwagen (2. Klasse, TGV) (German) | classification |
| Bü | Bahnübergangssignal (German) | railway signal |
| Bu | Brunsbergstunneln (Swedish) | station code |
| Abbreviation | Designation | |
|---|---|---|
| BÜ | Bahnübergang (German) | railway installation |
| Bu | Großraumwagen (2. Klasse, TGV) (German) | classification |
| Bü | Bahnübergangssignal (German) | railway signal |
| Bu | Brunsbergstunneln (Swedish) | station code |