Schlangenbad, could you tell me, what is the exact model of the trolley-bus? I have asked about Insterburg trolley-buses on several German trolley-bus forums, but people don't know it.

Maybe, you can recommend some literature about German trolley-buses? The cars are very interesting, but almost unknown. Thanks to drehschreibe-online.de, I've found a lot of information and technical data.

Greetings from Ukraine!