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What technical and/or operational criteria need to be fulfilled by a system to be included into this article? In German Wikipedia there have been extensive and rather emotional discussions whether to include Frankfurt's system in the U-Bahn category which ended with the decission to not include it, giving Germany four U-Bahn systems (Berlin, Hamburg, Munich and Nuremberg). The problem in said case was that the operator in Frankfurt officially calls it "U-Bahn", but there is generally a broad consensus in professinal literature that it is a "Stadtbahn", or light rail system, because a U-Bahn is generally considered to be completely separated from all other means of transport, whilst all lines of Frankfurt's system have street-bound sections at some point. So, which systems should be included here and should Frankfurt be deleted following the result of the discussion in German Wikipedia? MissyWegner (talk) 09:27, 18 June 2023 (UTC)[reply]
Frankfurt should be removed. It was irritating to see it on the list. Always every city in North Rhine-Westphalia has a Stadtbahn system, and they are not included. They all use the U symbol, but that doesn't make them metro systems.--62.96.99.98 (talk) 01:23, 3 July 2024 (UTC)[reply]