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My, I've ridden a lot of different metro systems. No wonder I couldn't resist buying Transit Maps of the World (a beautiful and addictive book).
There may be more. I think I just walked around Sydney, but can't remember. I know I took trams in Amsterdam, but I might have also used their metro. And, in some cases, I wasn't sure about all of the multiple systems within one city. For example, I think the trains I took in Yokohama were either part of the Tokyo system or Japan Rail ones, but I'm not sure.
There may be more. I think I just walked around Sydney, but can't remember. I know I took trams in Amsterdam, but I might have also used their metro. And, in some cases, I wasn't sure about all of the multiple systems within one city. For example, I think the trains I took in Yokohama were either part of the Tokyo system or Japan Rail ones, but I'm not sure.