In the federal state Brandenburg, there were 798 in service around Pritzwalk (to Meyenburg -> Güstrow, Kyritz -> Neustadt(Dosse) and Putlitz), operated by the Prignitzer Eisenbahn. A little visualisation: (Güstrow - Meyenburg 60 km, Meyenburg - Neustadt(Dosse) 63 km, Pritzwalk - Putlitz 17 km, Neustadt(Dosse) - Neuruppin 29 km, Neustadt(Dosse) - Rathenow 35 km). My suggestion: Güstrow - Meyenburg with 80 km. Some pictures: https://www.drehscheibe-online.de/foren/read.php?017,10033026 https://www.drehscheibe-online.de/foren/read.php?17,5911117,5911117 https://www.drehscheibe-online.de/foren/read.php?17,5920687 https://www.drehscheibe-online.de/foren/read.php?17,5920763 The Prignitzer Eisenbahn operated with the BR 798 (Uerdinger Schienenbus) from 1996 to 2003. One of them still exists today and operates for the Hanseatische Eisenbahn (also in this region). Some of my own pictures: 798 610 ("T2") in Meyenburg from Güstrow. The Prignitzer Eisenbahn modified the 798 with little backlights, picture from Wendisch Priborn. The route has still today a few stations with semaphores, picture from Ganzlin. Krakow am See (from 2022, this level crossing is still working) Those routes would bring another german branch line to Train Sim World and they have some particularities.
Bring it on and 798 from this route can then serve as a basis for it's 1950s-1980s version for Niddertalbahn if needed. Backdate this to the GDR era you get DR BR171/172 Railbus basically the East German 796/798
