The JR Pass is also valid only on JR line portion of the following through-services: Kanto area: JR Chuo/Sobu line through-services to Tokyo Metro Tozai Line (valid for Mitaka-Nagano and Nishi-Funabashi-Tsudanuma); JR Joban line through-services to Tokyo Metro Chiyoda Line (valid for Kashiwa/Abiko/Toride-Ayase);