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! City !! System Name
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|[[Amsterdam]], [[Netherlands]]|| Amsterdam Metro
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|[[Athens]], [[Greece]]|| Athens Metro
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|[[Barcelona]], [[Spain]]|| Barcelona Metro
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|[[Boston]], [[United States]]|| Massachusetts Bay Transportation Authority (or "T")
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|[[Brussels]], [[Belgium]]|| Brussels Metro
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|[[Budapest]], [[Hungary]] || Budapest Metro
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|[[Pyongyang]], [[North Korea|Democratic People's Republic of Korea]]||Pyongyang Metro
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|[[Rotterdam]], [[Netherlands]]|| Rotterdam Metro
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|[[Samara]], [[Russia]] || Samara Metro