The city of Duisburg is located at the mouth of the river Ruhr into the Rhine. It has almost half a million inhabitants, but only two tram lines (901, 903) and a light rail line (U79). Two of the three lines connect Duisburg with neighboring cities: the U79 suburban train runs to Düsseldorf, the tram line 901 has its terminus in Mülheim an der Ruhr.

Both systems, which have a total length of almost 45 kilometres and the city buses are operated by → DVG (Duisburger Verkehrsgesellschaft).