I still Wrote an email to DTG without any reactions, but here is my Suggestion The Route is Operated by the Waldbahn a subcompany of Die Länderbahn DLB the beautiful scenery next to the River Schwarzer Regen/Black Rain and in the First German National Park „Bayerischer Wald“ (Bavarian Forest) is one reason another is the Great vehicle: DB Class 650/ Stadler Regioshuttle Rs1 There is also an Wikipedia aritcle and a Article in the Newspaper „Süddeutsche Zeitung“ (Souther-German Newspaper)