| Abbreviation | Designation | |
|---|---|---|
| AP | Arbeitspaket (German) | |
| AP | Abschnittsprüfung (im Bahnhof) (German) | rail transport operations |
| Ap | Großraumwagen (1. Klasse) (German) open coach (1st class) | classification |
| Äp | Älvstorp (Swedish) | station code |
| Äp | Äppelbo (Swedish) | station code |
| Ap | Aspeå (Swedish) | station code |
| Åp | Åstorp (Swedish) | station code |
| 4819 / AP | Pinneberg (German) | station code |
| AP | Absperrposten (Gleisbau) (German) Access control guards | profession |