4 September 2008 - Frankfurt am Main – Verkehrsmuseum Schwanheim. A very nice O-bus (trolleybus) that ran first in Offenbach, then in Kaiserslautern before coming to Frankfurt.Frankfurt am Main – Verkehrsmuseum Schwanheim. A very nice O-bus (trolleybus) that ran first in Offenbach, then in Kaiserslautern before coming to Frankfurt. Autor: dvigar