|
| | Sonnen Tiefbau GmbH | Berlin, Hamburg, Landsberg/ Halle |
| | HOCHTIEF Infrastructure GmbH/Building | München |
| | Ed. Züblin AG | Berlin, Hamburg, Dresden, Hannover |
| | HOCHTIEF Infrastructure GmbH/Building | Mühlheim am Main |
| | HOCHTIEF PPP Solutions GmbH | Essen |
| | Ed. Züblin AG | Hamburg, Berlin, Dresden |
| | Aris Immobiliengesellschaft mbH | Berlin |
| | Ed. Züblin AG | Stuttgart |
| | Vossloh Rail Services Deutschland GmbH | Bützow |
| | HOCHTIEF Infrastructure GmbH/Building | Frankfurt am Main |
| | HOCHTIEF Infrastructure GmbH/Building | Erfurt |
| | STRABAG Rail GmbH | Essen |
| | Ed. Züblin AG | Hamburg, Berlin, Dresden |
| | HOCHTIEF Infrastructure GmbH/Building | Frankfurt am Main |
| | Drees & Sommer SE | München |