The is a railway line in Japan operated by the East Japan Railway Company (JR East). The Yokosuka Line connects Tokyo Station with in Yokosuka, Kanagawa. Officially, the name Yokosuka Line is assigned to the 23.9 km segment between and Kurihama stations, but the entire route is commonly referred to as the Yokosuka Line by JR East for passenger service. Basic data Official definition Operators, distances: East Japan Railway Company (JR East) (Services and tracks) Ōfuna — Kurihama: Japan Freight Railway Company (JR Freight) (Services) Ōfuna — Zushi: Double-tracked section: Ōfuna – Yokosuka Railway signalling: Centralized Traffic Control (CTC) Route as operated by JR East Tokyo — Kurihama: Double-tracked section: Tokyo – Yokosuka Railway signalling: Centralized Traffic Control (CTC) Maximum speed: Route The Yokosuka Line runs underground between Tokyo and Shinagawa (parallel to the Tōkaidō Main Line, the Yamanote Line and the Keihin-Tōhoku Line) then branches to the west along the Tōkaidō Shinkansen into the city of Kawasaki. (This alignment, technically known as the Hinkaku Line(, ), was originally built for freight usage; see below.) It rejoins the Tōkaidō Main Line corridor near Tsurumi Station and follows the Tōkaidō Main Line to Ōfuna, where it branches off to the southeast along the original Yokosuka Line toward the Miura Peninsula. Services Yokosuka Line local trains make all stops. Most trains have 11 cars, with two of those being Green (first class) cars. Other trains between Tokyo and Zushi are made up of 15 cars—an 11-car set joined to a 4-car set. (Due to shorter platform length at stations south of Zushi, only 11-car trains are operated to Kurihama.) Some day-time trains operate between Zushi and Kurihama and these trains are made up of 4-car set without Green Cars. Shōnan-Shinjuku Line trains enter or exit the Yokosuka Line at Nishi-Ōi. Utsunomiya–Yokosuka Line through services make all stops on the Yokosuka Line between Nishi-Ōi and Zushi, while Takasaki–Tōkaidō Line through services operate Rapid service within the Yokosuka Line, between Nishi-Ōi and Ōfuna, skipping Nishi-Ōi, Shin-Kawasaki, Hodogaya and Higashi-Totsuka. For information on the Narita Express and other limited express services, see their respective articles. The Yokosuka Line has through service onto the Sōbu Line to and beyond. Some trains travel as far as: on the Sotobō Line on the Uchibō Line via on the Narita Line on the Kashima Line on the Sōbu Main Line Station list The section between Yokosuka and Kurihama is