The London Underground is a public rapid transit system serving London, England.

The Tyne and Wear Metro is an extensive light rail system serving Newcastle, Gateshead, South Tyneside, North Tyneside, and Sunderland.

The Dortmund Stadtbahn is a light rail system that serves the city of Dortmund in North Rhine-Westphalia, Germany.

The Frankfurt U-Bahn is a rapid transit system serving the city of Frankfurt and the surrounding region.

The Karlsruhe Stadtbahn is a German tram-train system combining tram lines in the city with railway lines in the surrounding countryside.

The Hanover Stadtbahn is a comprehensive, efficient tramway network operating in the city and region of Hanover, Germany.

The Stuttgart Stadtbahn is an extensive light rail system offering efficient transportation across the city.