The Rinkai Line is a railway line in Tokyo, Japan. It is the only line operated by the third-sector company Tokyo Waterfront Area Rapid Transit. It connects central Tokyo to the artificial islands of Aomi and Odaiba. The line is served by some trains on the East Japan Railway Company Saikyō Line which continue on to Shinjuku, Ikebukuro, Ōmiya, and Kawagoe.

The Kawagoe Line is a railway line in Japan operated by the East Japan Railway Company, which connects the cities of Saitama, Kawagoe, and Hidaka in Saitama Prefecture. The main transfer stations on the line are Ōmiya, Kawagoe, and Komagawa.