[2] Other subsidiaries provide waste management and housing services for the city, in addition to operating the public baths.

The subsidiaries Kölner Verkehrs-Betriebe (KVB) and Häfen und Güterverkehr Köln (HGK) operate the city's urban and industrial transportation systems respectively.

[10] City rail transport in Cologne dates back as far as 1877 when the first horse-drawn railway was operated, by the 1900s electric trams had been introduced.

[6] The company operates four ports in Cologne; Niehl I, Niehl II, Godorf, and Deutz, as well as rail linked container terminals in Hürth, Bergisch Gladbach and Düren and further afield;[18] ~500,000 TEU of containerised traffic and nearly 12 million tonnes of cargo were handled in 2009, making the port of Cologne the second largest in Germany after Duisburg.

[20] Niehl I is the primary container port with ~450,000 TEU of container traffic in 2009 and equipped with 36m reach gantry cranes allowing side stacked vessels up to 4 deep to be unloaded, other cargos handled include general dry bulk, fuel oils and paper.

[22] Deutz handles low value non-hazardous goods including sand, gravel, animal feed, grain, lumber and liquid chalk.

[30][31] Wohnungsgesellschaft der Stadtwerke Köln mbH is the subsidiary which provides housing for city employees.