| Abbreviation | Designation | |
|---|---|---|
| AS | Ausschreibung (German) Invitation to bid (ITB) / Invitation of tenders | |
| AS | Ausfahrsignal (German) | rail transport operations |
| AS | Automatische Stromabnehmersenkeinrichtung (German) Automatic current collectors lowering device | rail transport operations |
| AS | Aktsiaselts Spacecom (Estonian) | railway company |
| AS | Automatische Stromabnehmersenkeinrichtung (German) | railway technology |
| as | agilis-Schnellzug (German) | train category |
| AS | AutoShuttle, Autozug Sylt Shuttle (German) | train category |
| a.s. | akciová společnost (Czech) joint-stock company | organization |
| AS | aksjeselskap (Norwegian) | organization |
| A/S | aktieselskab (Danish) joint-stock company | organization |
| Äs | Älvsjö (Swedish) | station code |
| Ås | Årsta (Swedish) | station code |
| Ås | Ås (Swedish) | station code |
| AS | Autozug Sylt Shuttle (German) | offer / trademark |