The Tokiwa (ときわ) is a limited express service operated by East Japan Railway Company between Shinagawa in Tokyo and Iwaki via the Joban Line and Ueno-Tokyo Line since 14 March 2015. The services replaced the former Fresh Hitachi services operated on the Joban Line between Ueno and Iwaki. The Tokiwa train service name was also formerly used for semi-express services operated by Japanese National Railways (JNR) from June 1958 until March 1985.

Shinagawa Station is a major railway station in the Takanawa and Konan districts of Minato, Tokyo, Japan, operated by East Japan Railway Company, Central Japan Railway Company, and the private railway operator Keikyu. The Tokaido Shinkansen and other trains to the Miura Peninsula, Izu Peninsula, and the Tōkai region pass through here. Though a major station in Tokyo, Shinagawa is not served by the Tokyo subway network. However, it is connected to the Toei Asakusa Line via Keikyu through services.