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That doesn't sound right. NRW also has U-Bahns in cities like Köln, Düsseldorf, and cities in the Ruhrgebiet.

https://www.kvb.koeln/fahrtinfo/liniennetzplaene.html

https://www.duesseldorf-tourismus.de/files/assets/pdf/broschueren/Linienplan_gesamt_deutsch.pdf

https://de.wikipedia.org/wiki/U-Bahn-Linie_35_(Bochum) (which is not to be confused with a tram/Straßenbahn which the city also has /info/en/?search=Trams_in_Bochum/Gelsenkirchen)

If they are not counted just because there's no agreement on how to call them, then I'd rather say that one should write "there are U-Bahn and Stadtbahn lines in several cities" without stating a specific number, because saying there are only "four" is somewhat of a misrepresentation of the actual situation. Nakonana ( talk) 11:27, 30 April 2023 (UTC) reply

Does Wuppertal fit somewhere on here? I know it's not a conventional system, but it is a grade separated rapid transit system that servesbtge city. It's not like it's done tourist line. Rckania ( talk) 16:23, 11 October 2023 (UTC) reply