The is a railway line operated by the

East Japan Railway Company The is a major passenger railway company in Japan and is the largest of the seven Japan Railways Group companies. The company name is officially abbreviated as JR-EAST or JR East in English, and as in Japanese. The company's headquarters ar ...

(JR East) adjacent to

Tokyo Bay is a bay located in the southern Kantō region of Japan, and spans the coasts of Tokyo, Kanagawa Prefecture, and Chiba Prefecture. Tokyo Bay is connected to the Pacific Ocean by the Uraga Channel. The Tokyo Bay region is both the most populou ...

, paralleling the western (i.e., inner) shore of the

Bōsō Peninsula The is a peninsula that encompasses the entirety of Chiba Prefecture on Honshu, the largest island of Japan. It is part of the Greater Tokyo Area. It forms the eastern edge of Tokyo Bay, separating it from the Pacific Ocean. The peninsula covers ...

. It connects Soga Station in the city of Chiba to Awa-Kamogawa Station in the city of Kamogawa, passing through the municipalities of Chiba, Ichihara,

Sodegaura 260px, Sodegaura park is a city located in Chiba Prefecture, Japan. , the city had an estimated population of 64,901 in 28,156 households and a population density of 680 persons per km². The total area of the city is . Geography Sodegaura ...

, Kisarazu, Kimitsu,

Futtsu 260px, Futtsu City Hall is a city located in Chiba Prefecture, Japan. , the city had an estimated population of 42,476 in 18,115 households and a population density of 210 persons per km². The total area of the city is . Geography Futtsu is l ...

, Kyonan, Tateyama, and

Minamibōsō is a city located in Chiba Prefecture, Japan. , the city had an estimated population of 37,143 in 17,175 households and a population density of 160 persons per km². The total area of the city is , making it the fifth largest city in Chiba P ...

. The line is connected at both ends to the Sotobō Line. The name of the Uchibō Line in the

Japanese language is spoken natively by about 128 million people, primarily by Japanese people and primarily in Japan, the only country where it is the national language. Japanese belongs to the Japonic or Japanese- Ryukyuan language family. There have been ...

is formed from two

kanji are the logographic Chinese characters taken from the Chinese script and used in the writing of Japanese. They were made a major part of the Japanese writing system during the time of Old Japanese and are still used, along with the subsequ ...

characters. The first, , means "inner" and the second, is the first character of the Bōsō. The name of the line thus refers to its location along the inner part of the Bōsō Peninsula in relation to the Tokyo Metropolitan Area, as opposed to the Sotobō Line, "outer Bōsō" which is on the opposite side of the peninsula. South of Kimitsu is single track, and north of Kimitsu is double track.

Station list

;Legend * ● : All trains stop * , : All trains pass ; Notes * Local trains stop at every station. * See Limited Express '' Sazanami'' article also. Note: Special Rapid services were discontinued from 4 March 2017.

Operation

The Uchibō Line operates local service with trains generally originating and terminating at Chiba Station. Trains headed directly for

Tokyo Station Tokyo Station ( ja, 東京駅, ) is a railway station in Chiyoda, Tokyo, Japan. The original station is located in Chiyoda's Marunouchi business district near the Imperial Palace grounds. The newer Eastern extension is not far from the Ginza ...

merge with the Sotobō Line between Soga and Chiba Stations, and with the

Sōbu Main Line The is a Japanese railway line operated by the East Japan Railway Company (JR East) in Japan. It connects Tokyo with the east coast of Chiba Prefecture, passing through the cities of Funabashi, Chiba, and Chōshi. Its name derives from the ol ...

between Chiba and Tokyo, while express and commuter trains merge with the

Keiyō Line The 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 around Tokyo, consisting of the ...

from Soga station.

Local trains

Daytime local service from Chiba to and (sometimes to ) is generally 2 round trips per hour. In addition, 1 round trip per hour runs from Kisarazu to (and to through the Sotobō Line).

Keiyō Line through service

Local, Rapid, and Commuter Rapid trains operate through services on the Uchibō Line between and . In the morning, there are three inbound Rapid and Commuter Rapid trains, and in the evening, there are five outbound Rapid and Commuter Rapid trains and two inbound Local trains. On weekends and holidays, Rapid trains replace the Commuter Rapid trains. One of the inbound morning trains originates from .

Yokosuka Line—Sōbu Line Rapid through service

Trains leaving north from connect directly to the

Sōbu Line (Rapid) The Sōbu Line (Rapid) ( ja, 総武快速線, ) is a railway service on the Sōbu Main Line in Tokyo and Chiba Prefecture, Japan, operated by East Japan Railway Company (JR East). It connects Tokyo Station in Chūō, Tokyo with Chiba Station ...

, with some continuing onto the

Yokosuka Line 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 an ...

. Since the October 2004 timetable revision, all trains now stop at Nagaura and

stations.

Limited express trains

E257-500 Sazanami Kaihin-Makuhari 20061021

The

limited express A limited express is a type of express train service. It refers to an express service that stops at a limited number of stops in comparison to other express services on the same or similar routes. Japan The term "limited express" is a common ...

train '' Sazanami'' runs from

to Kimitsu (and Tateyama station during busy periods). The limited express ''View Sazanami'' formerly ran on the Uchibō Line as well, but it was merged with the ''Sazanami'' following the timetable revision on December 10, 2005. The limited express '' Shinjuku Sazanami'' runs from to Tateyama on weekends and during peak seasons.

Rolling stock

Local service * E131 series 2-car EMUs (since 13 March 2021) * 209-2000/2100 series 4/6-car EMUs (since 1 October 2009) Keiyō Line through service * 209-500 series 10-car EMUs * E233-5000 series 10-car EMUs Yokosuka Line—Sōbu Line Rapid through service * E217 series 11+4-car EMUs with 2 green cars * E235-1000 series 11+4-car EMUs with 2 green cars ''Sazanami'' and ''Shinjuku Sazanami'' Limited Express *

255 series The , branded , is a DC electric multiple unit (EMU) train type operated by East Japan Railway Company (JR East) in Japan. It was introduced into commercial service on 2 July 1993, and was specifically designed to be used limited express servi ...

EMUs with 1 green car * E257-500 series EMUs

History

The Uchibō line began operation in 1912, and was originally known as the . It operated from Soga Station to Anegasaki Station in Ichihara. Several extensions were built over the next few years, and in 1919 it reached Awa-Hōjō (present day Tateyama). At this time it was renamed the . By 1925 it had been extended to its present-day terminus, Awa-Kamogawa Station. In 1929, the Hōjō Line was incorporated into the Bōsō Line. However, in 1933, the original section between Soga and Awa-Kamogawa Stations again became its own line, this time renamed the , and in 1972 it received its current name. The Soga - Kimitsu section was duplicated between 1964 and 1971, and the entire line was electrified between 1968 and 1971. Individual section dates as given in the Timeline section below.

Timeline

*March 28, 1912 – Kisarazu Line (Soga to Anegasaki) begins operation *August 21, 1912 – Extended from Anegasaki to Kisarazu *January 15, 1915 – Extended from Kisarazu to Kazusa-Minato *October 11, 1916 – Extended from Kazusa-Minato to Hamakanaya *August 1, 1917 – Extended from Hamakanaya to Awa-Katsuyama *August 10, 1918 – Extended from Awa-Katsuyama to Nako-Funakata *May 24, 1919 – Extended from Nako-Funakata to Awa-Hōjō; renamed Hōjō Line *June 1, 1921 – Extended from Awa-Hōjō to Minamihara *December 20, 1922 – Extended from Minamihara to Emi *July 25, 1924 – Extended from Emi to Futomi *July 11, 1925 – Extended from Futomi to Awa-Kamogawa *June 16, 1926 – Takeoka station opened *May 20, 1927 – Chitose railyard opened *August 15, 1929 – Bōsō line extended to Awa-Kamogawa; Hōjō Line incorporated into Bōsō Line *August 1, 1930 – Chitose railyard is upgraded to a station *April 1, 1933 – Bōsō line from Soga to Awa-Kamogawa (the run of the former Hōjō Line) is renamed Bōsō West Line *November 20, 1941 – Iwane station opened *March 1, 1946 – Awa-Hōjō station renamed Tateyama Station *January 10, 1947 – Nagaura station opened *April 10, 1956 – Shūsai station renamed Kimitsu Station *July 1, 1964 – Double-track section built between Soga and Hamano *September 20, 1964 – Double track extended from Hamano to Yawatajuku *July 4, 1965 – Double track extended from Yawatajuku to Goi *May 26, 1968 – Double track extended from Goi to Nagaura *July 13, 1968 – Electric wires extended from Chiba station, past Sogo, extending to Kisarazu *March 20, 1969 – Double track extended from Nagaura to Naraba *July 10, 1969 – 135 C57-105 steam engines removed from service *July 11, 1969 – Electric wires extended from Kisarazu to Chikura *March 18, 1970 – Double track extended from Naraba to Kisarazu *March 24, 1970 – Double track extended from Kisarazu to Kimitsu *July 1, 1971 – Electric wires extended from Chikura to Awa-Kamogawa *July 15, 1972 – Renamed Uchibō Line *March 31, 1974 – Naraba station renamed Sodegaura *November 15, 1982 – Freight service between Kisarazu and Awa-Kamogawa discontinued *April 1, 1987 – Acquired by East Japan Railway Company following the division and privatization of JNR initiated by prime minister Yasuhiro Nakasone;

Japan Freight Railway Company , or , is one of the seven constituent companies of Japan Railways Group (JR Group). It provides transportation of cargo nationwide throughout Japan. Its headquarters are in Shibuya, Tokyo near Shinjuku Station. The Japan Railways Group was fou ...

becomes a second class railway enterprise between Soga and Kisarazu *November 1, 1996 – Japan Freight Railway Company second class enterprise between Soga and Kisarazu is discontinued *February 4, 2001 – ATS-P usage implemented between Chiba and Iwane *October 1, 2009 - 209-2000/2100 series EMUs are introduced on local services *March 13, 2021 - E131 series EMUs are introduced on local services between Kisarazu and Awa-Kamogawa, replacing most 209-2000/2100 series trains in that section

References

{{DEFAULTSORT:Uchibo Line Lines of East Japan Railway Company Railway lines in Chiba Prefecture 1067 mm gauge railways in Japan Railway lines opened in 1912 1912 establishments in Japan