>>971466Here's a list of cities with at least five underground stations:
Edmonton, Canada.
Antwerp, Brussels, Charleroi, Belgium.
Rouen, France.
Bielefeld, Bochum (and Herne), Bonn, Cologne, Dortmund, Duisburg, Düsseldorf, Essen, Frankfurt, Gelsenkirchen, Hannover, Mülheim, Stuttgart, Germany.
Guadalajara, Mexico
Porto, Portugal.
Volgograd, Russia.
Alicante, Málaga, Spain.
Istanbul, Turkey.
Kryvyi Rih, Ukraine.
Buffalo, Newark, Pittsburgh, Philadelphia, San Francisco, Seattle, St. Louis, United States.
Valencia, Venezuela.