Roman 112 UD was a urban and suburban bus made at Intreprinderea Autobuzul Bucuresti. It used a RABA-MAN D 2156 HM 6U six cylinder, 192 HP at 2100 rpm engine.
Bibliography:
I. MOTOC, I. POPESCU, Autobuze cu motoare diesel orizontale, Editura Tehnica, 1979
More pictures here.