臺北都會區大眾捷運系統通車迄今20餘年，已成為大臺北地區所不可或缺的大眾運輸。隨著路線不斷增加，自2020年1月起，跨不同縣市之環狀線第一階段也已通車營運。然而，近期新北市政府對外表示，考慮將原委託臺北市營運之該路線收回，自負盈虧。因大眾運輸的性質，是否宜依不同路線、區分由不同捷運公司營運，其細節涉及大眾運輸系統財產之權利行使。甚至營運所需之著作權或旅客之個人資料，如涉及不同主體，亦有權利共同行使之可能議題。本文將由法律觀點出發，依大眾捷運法等法令進行研析，就本案提出具體建議，以供主管機關或研究者參考。

After more than 20 years' operation of mass rapid transit system of Taipei urban area, Taipei Metro has become indispensable in civic life. With increasing of operation routes, the new Circular line of first stage on the Taipei mass rapid transit system also had begun operations on January 31st, 2020. After July of 2020, for self-financing or other reasons, New Taipei City tended to withdraw the operation contract which existed in Taipei and New Taipei City's metro. Although this topic of it was just a discussion, the operation contract of Circular line existed probable legal issues of exercise joint rights, such public-owner land, copyright, personal data and so on. This article will propose corresponding suggestions by The Mass Rapid Transit Act, Copyright Act, Personal Data Protection Act and related laws, and hope useful for planning or making decisions of its authority.