The Keihin–Tōhoku Line (Japanese: 京浜東北線, Hepburn: Keihin-tōhoku-sen) is a railway line in Japan which connects the cities of Saitama, Kawaguchi, Tokyo, Kawasaki, and Yokohama. It is part of the East Japan Railway Company (JR East) network. The line's name is derived from the characters for Tokyo (Japanese: 東京), Yokohama (Japanese: 横浜) and the Tōhoku Main Line (Japanese: 東北本線). The line runs parallel with the Tōkaidō Main Line between Yokohama and Tokyo and the Utsunomiya Line (part of the Tōhoku Main Line) except between Ueno and Akabane stations where the two lines are physically separate and thus alternate routes.
Most Keihin–Tōhoku Line trains have a through service onto the Negishi Line between Yokohama and Ōfuna stations. As a result, the entire service between Ōmiya and Ōfuna is typically referred to as the Keihin-Tōhoku–Negishi Line (Japanese: 京浜東北・根岸線) on system maps and in-train station guides. Keihin–Tōhoku–Negishi Line trains are recognizable by their light blue stripe (the line's color on maps is also light blue).
