I think most of these stations are on networks that had a coherent planning that was followed through from the beginning - like in Munich, where the U-Bahn netw

I think most of these stations are on networks that had a coherent planning that was followed through from the beginning - like in Munich, where the U-Bahn network started to be built in the 1960s (late compared to Berlin and Hamburg) and was continuously under construction, mostly following the original plan, until 2010. Munich has two of these cross-platform transfer stations, Scheidplatz and Innsbrucker Ring. Both of them were built with 4 tracks from the beginning and had to wait several years (or even decades) until the cross-platform transfer concept was actually fully used with two lines coming from different directions and also continuing in different directions. There are two more four-track stations (Münchner Freiheit and Olympiazentrum) which will probably never be used as cross-platform transfer stations - I think at Olympiazentrum the additional tracks were intended to increase capacity for large events (football matches, concerts etc.).