Career
 | AET KT4D | Almatyelektrotrans | 6 |
 | Braicar KT4D | Braicar S.A. | 1 |
 | BVG KT4D | Berliner Verkehrsbetriebe | 5 |
| EVAG KT4D | Erfurter Verkehrsbetriebe AG | 2 |
 | GETP KT4D | GorElectroTrans Pyatigorsk | 1 |
 | LET KT4D | LvivElektroTrans | 7 |
 | Liepājas tramvajs KT4D | Liepājas tramvajs | 3 |
| OTL KT4D | Oradea Transport Local S.A. | 4 |
| RATC KT4D | RAT Craiova | 1 |
| RATPh KT4D | Ploieşti Transport Operator | 4 |
| RATUC KT4D | Regia Autonomă de Transport Urban Călători | 5 |
 | TLT KT4D | Tallinna Linnatranspordi AS | 20 |
| TWSB KT4D | Thüringerwaldbahn und Straßenbahn Gotha | 1 |
| ViP KT4D | Verkehrsbetrieb Potsdam | 3 |
