The Cologne light rail network has a length of almost 200 kilometres (as of 2016), of which approx. 30 kilometers are underground. The lines 1, 7, 9, 12 and 15 are operated with low floor vehicles (35 cm floor height), the other lines belong to the hight-floor network with a floor height of one metre. Three interurban routes are partly operated as railways: Two run from Cologne to Bonn and one connects of Cologne with Frechen. The light rails as well as the buses are operated by KVB (Kölner Verkehrs-Betriebe AG).