| Abbreviation | Designation | |
|---|---|---|
| a | Aufstellgleis (German) | railway installation |
| Ax | (Anzahl der) Achsen (German) | railway technology |
| A | Ampere | railway technology |
| A | 1. Klasse (German) first class / 1st class | classification |
| 81 / AT | Österreich, Republik Österreich (German) Austria, Republic of Austria | country code |
| A | A-Bahn (German) | train category |
| Lf 2 | Langsamfahrsignal: Anfangscheibe (A) (German) | railway signal |
| A | Augsburg Hbf, Stadt Augsburg (German) | fare point / vehicle registration plate |
| A | Alingsås (Swedish) | station code |
| Ä | Ängelholm (Swedish) | station code |
| A | Anten (Swedish) | station code |
| Å | Åsbro (Swedish) | station code |
| A | S-Bahn München – ‘Linie A’ (Dachau ↔ Altomünster) (German) | transportation line |
| A | RB Hamburg (ehem. Altona), Regionalbereich Hamburg (German) RB Hamburg (formerly Altona) | railway administration |
| A | Albertsbahn, Albertsbahn AG (German) | railway company |
| A | Arbeitszug (German) Work train | vehicle fleet |
| A | Arztwagen (German) | classification |
| SE-A | Stockholm (stad), Stockholms stad (Swedish) | country code |
| 01 / A | BD Hamburg (1953–1994), Bundesbahndirektion Hamburg (German) | railway administration |
| A / Alt | K.E.D. Altona (1895–1918), Königliche Eisenbahn-Direction Altona (German) | railway administration |