| Abbreviation | Designation | |
|---|---|---|
| TDM / MRB | Transdev Mitteldeutschland, Transdev Mitteldeutschland GmbH (German) | railway company |
| TDRO / MRB | Transdev Regio Ost, Transdev Regio Ost GmbH (German) | railway company |
| MRB | MittelrheinBahn (German) | offer / trademark |
| MRB | Mitteldeutsche Regiobahn (German) | offer / trademark |