Ōsaki Station (大崎駅, Ōsaki-eki) is a railway station in Shinagawa, Tokyo, Japan, jointly operated by East Japan Railway Company (JR East) and Tokyo Waterfront Area Rapid Transit (TWR). Ōsaki Station is served by the following JR East lines. It also forms the northern starting point of the TWR Rinkai Line to Shin-Kiba. Most Saikyō Line trains operate through to Shin-Kiba on the Rinkai Line. The station has four island platforms serving eight tracks. Platforms 1 to 4 are for the Yamanote Line, and 5 to 8 are shared by the Saikyō Line, the Shōnan-Shinjuku Line, and the Rinkai Line.