The line is 73.3 km long from Tokyo Station to Kurihama Station, is of 1,067 mm gauge and is double-tracked between Tokyo and Yokosuka. Officially the name Yokosuka Line is assigned to the 23.9 km segment between Ōfuna Station and Kurihama Station, but because the trains on the Yokosuka Line departs from Tokyo Station, the entire route of the trains is usually recognized as the Yokosuka Line.
It runs underground from Tokyo to Shinagawa (parallel to the Tōkaidō Main Line, the Yamanote Line and the Keihin-Tōhoku Line), then branches to the west following the Tōkaidō Shinkansen into the city of Kawasaki (this section, commonly called the , is originally a freight branch of the Tōkaidō Main Line). 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 toward stops on the Miura Peninsula.
There are many through service trains (more frequent than trains for Tokyo) to the Sōbu Main Line for , and , to the Narita Line for , to the Kashima Line for , to the Sotobō Line for , and to the Uchibō Line for . Up trains for Narita Airport Station are called Rapid Airport Narita, but the reverse trains are not.
|Station||Connections||Ward / City|
|Tokyo||Sōbu Main Line (through service), Shinkansen, Yamanote Line, Keihin-Tōhoku Line, Tōkaidō Main Line, Chūō Main Line, Keiyō Line, Musashino Line|
Tokyo Metro Marunouchi Line
|Shimbashi||Yamanote Line, Keihin-Tōhoku Line, Tōkaidō Main Line|
Tokyo Metro Ginza Line, Toei Asakusa Line, Yurikamome
|Shinagawa||Tōkaidō Shinkansen, Yamanote Line, Keihin-Tōhoku Line, Tōkaidō Main Line, Keikyu Main Line|
|Nishi-Ōi||Shōnan-Shinjuku Line (through service)||Shinagawa, Tokyo|
(not yet opened)
|Nambu Line, Tōkyū Tōyoko Line, Tōkyū Meguro Line|
(Planned opening 2009)
|Shin-Kawasaki||Nambu Line (Kashimada Station, 8 min. walk)||Saiwai-ku, Kawasaki|
|Yokohama||Keihin-Tōhoku Line, Negishi Line, Tōkaidō Main Line, Tōkyū Tōyoko Line, Keikyu Main Line, Sagami Railway, Yokohama Subway Blue Line, Minatomirai Line||Nishi-ku, Yokohama|
|Totsuka||Tōkaidō Main Line (shared platform), Yokohama Subway Blue Line|
|Ōfuna||Tōkaidō Main Line, Negishi Line, Shonan Monorail||Kamakura|
|Kamakura||Enoshima Electric Railway|
|Zushi||Keikyū Zushi Line (Shin-Zushi Station, 8 min. walk)||Zushi|
|Kurihama||Keikyū Kurihama Line (Keikyū Kurihama Station, 5 min. walk)|
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