Trams from Bonn also operate urban services in Cologne on the interurban line to Bonn: not all trams run the full route. This Bonn tram only operated between Cologne and Sürth.
During my visit there were quite a few gaps in the timetable each day, including on this interurban line. And when a service is cancelled during off‑peak hours, the waiting time jumps to 40 minutes — and I had just missed the previous tram…