The city of Krefeld (North Rhine-Westphalia) has about 220,000 inhabitants. It has a metre-gauge tram network with a system length of 35 kilometres, which is operated by → SWK (Stadtwerke Krefeld AG).

In addition, the Düsseldorf light rail line U76 goes to Krefeld. The 1.2 kilometre long section from Rheinstraße via Main Station to the intersection from the Krefeld tram network near the Voltastraße stop is equipped with a mixed-gauge track with four rails for the standard-gauge Düsseldorf Light Rail vehicles.