https://store.steampowered.com/app/1376750/OMSI_2_Addon_Dsseldorf_M2/
With the new OMSI 2 Mini DLC you can expand the OMSI 2 Dusseldorf DLC by another 11km drivable route in the northern part of the city with the Metrobus line M2.
NEW DLC Dusseldorf Line M2 available!
Source: Steam Community (opens in a new tab)