| Abbreviation | Designation | |
|---|---|---|
| X | Kreuzung (German) | rail transport operations |
| x | S-Bahn-Wagen (German) | classification |
| SE-X | Gävleborg, Gävleborgs län (Swedish) | country code |
| X | ExpressBus (BVG) (German) | train category |
| X | X-trafik (Swedish) | transport company |
| X | InterConnex (German) | train category |
| X | InterConnex (Leipzig ↔ Rostock ↔ Warnemünde) (German) | transportation line |