OVR has MAN NÜ 313 that are diesel-powered, but can have a different front door configuration. Case in point, two different NÜ 313s, one is a A20 DF and another is an EF were seen on the same route, the 735 from Lichtentanne's ZOB to Altenfeld's railroad station. This mini-travelogue accompains the DF doing the Altenfeld-bound route with the DF, and then back to Lichtentanne with the EF.
First, the DF goes into the Altenfeld-bound 735, making an indeleble impression between Lichtentanne, Heberndorf, Heinrichschutte until the terminus of Altenfeld. The bus manages to provide stability even with 310 hp.
Now, the EF takes over at Altenfeld, doing the route towards Lichtentanne. The difference is that the front door is smaller than the DF counterpart. Still, it handled the route between Altenfeld and Lichtentanne greatly.
MAN NÜ 313 (A20 DF and EF) CNG (from Sobol's MAN NL/NG Enhanced Pack) | Thüringer Wald, line 735 (from DLC Thüringer Wald, although with a private AI-list) | Omnibusverkehr-Rennsteig (WIP, coming in a repaintpack with all liveries of the DLC)