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Railway line in Japan

The Keiyō Line (京葉線) is a railway line connecting Tokyo and Chiba in Japan, paralleling the edge of Tokyo Bay. It is operated by the East Japan Railway Company (JR East). The line forms part of what JR East refers to as the "Tokyo Mega Loop" (東京メガループ) around Tokyo, consisting of the Keiyō Line, Musashino Line, Nambu Line, and Yokohama Line. It provides the main rail access to Tokyo Disney Resort and the Makuhari Messe exhibition center. The terminus at Tokyo Station is located underground, some distance to the south of the main station complex approximately halfway to Yūrakuchō Station. This means transferring between other lines at Tokyo Station can take between 15 and 20 minutes. The name "Keiyō" is derived from the second character of the names of the locations linked by the line, Tokyo (東京) and Chiba (千葉). It should not be confused with the Keiō Line, a privately operated commuter line in western Tokyo.

Keiyō Line "Local" (各駅停車 kakueki teisha)trains stop at all stations between Tokyo and Soga except Nishi Funabashi. Musashino Line ''Local'' through trains stop at all stations between Tokyo and Nishi Funabashi before continuing to the Musashino Line. Some trains stop at Nishi Funabashi, Minami Funabashi, Shin Narashino, and Kaihimmakuhari. Keiyō Line "Rapid" (快速 kaisoku) trains stop at Tokyo, Hatchōbori, Shin Kiba, Maihama, Shin Urayasu, Minami Funabashi, Kaihimmakuhari, and all stops to Soga.

Commuter rapid service (通勤快速) trains stop at Tokyo, Hatchōbori, Shin Kiba, and Soga. It only operated during the Weekday rush hour. Discontinued with effect of the timetable revision implemented on 16 March 2024.

All trains (except limited express services) stop at stations marked "●" and pass those marked "｜". Trains do not travel past those stations marked "∥". For the Wakashio and Sazanami limited express services, see their respective articles. No. StationJapaneseDistance (km)KeiyōLineMusashinoLine (thru)TransfersLocationBetweenstationsTotalLocalRapidMusashino ChibaMusashino Tokyo東京 0.0●● ●ChiyodaTokyo八丁堀1.21.2●●● Tokyo Metro Hibiya Line (H 12)Chūō越中島1.62.8●｜● Kōtō潮見2.65.4●｜● 新木場2.07.4●●●葛西臨海公園3.210.6●｜● Edogawa舞浜2.112.7●●●Disney Resort Line UrayasuChiba新浦安3.416.1●●● 市川塩浜2.118.2●｜● Ichikawa西船橋5.924.1∥∥●●Funabashi二俣新町4.422.6●｜∥Distance is from IchikawashiohamaIchikawa南船橋3.426.0●●●Distance between Nishi Funabashi and Minami Funabashi is 5.4 kmFunabashi新習志野2.328.3●｜● Narashino幕張豊砂1.730.0●｜●New station which opened on 18 March 2023. Mihama ku, Chiba海浜幕張1.731.7●●● 検見川浜2.033.7●● 稲毛海岸1.635.3●● 千葉みなと3.739.0●●Chiba Urban Monorail: Line 1Chūō ku, Chiba蘇我4.043.0●●

All Keiyō Line and Musashino Line rolling stock is based at the Keiyō Rolling Stock Center near Shin Narashino Station.

The Keiyo Line was initially planned as a freight only line. Its first section opened on 10 May 1975 as a link between the Chiba Freight Terminal (now the Mihama New Port Resort between Inagekaigan and Chibaminato Stations) and the freight yard next to Soga Station. Passenger service began on 3 March 1986 between and , and was extended east to Soga and west to Shin Kiba on 1 December 1988. Planners originally envisioned the Keiyo Line interfacing with the Rinkai Line at Shin Kiba, thus providing a through rail connection between Chiba and the Tokyo Freight Terminal in eastern Shinagawa, and also completing the outer loop for freight trains around Tokyo formed by the Musashino Line. This original plan would also allow through service with the Tokaido Main Line, allowing freight trains from central and western Japan to reach Chiba and points east. However, in the 1990s, as the artificial island of Odaiba began developing as a commercial and tourist area in the middle of the Rinkai Line route, the Rinkai Line was re purposed for use as a passenger line. While there is a through connection between the Rinkai Line and the Keiyo Line, it is only used by passenger trains in charter service, usually carrying groups to the Tokyo Disney Resort.

3 March 1986: First stage opened between and 1 December 1988: Second stage opened between and Minami Funabashi, and between and 18 March 2023: Opening of Makuharitoyosuna Station between Kaihimmakuhari and Shin Narashino, station numbers from Kaihimmakuhari to Chibaminato bumped up by one.

Effective from the timetable revision scheduled for 16 March 2024, all rapid and commuter rapid services on the Keiyō Line are set to be discontinued during both the morning and evening rush hour, leaving local service as the only service variation during these time periods. However, following requests from local and prefectural governments, two westbound rapid services to Tokyo Station in the morning rush were reinstated by JR East for the upcoming schedule revision.