Uchibō Line Explained

Uchibō Line
Color:	00BFFF
Type:	Regional rail
Locale:	Chiba Prefecture
Stations:	30
Open:	1912
Operator:	JR East
Linelength:	119.4km (74.2miles)
Speed:	110abbr=onNaNabbr=on
Map:
Map State:	collapsed

The is a railway line operated by the East Japan Railway Company (JR East) adjacent to Tokyo Bay, paralleling the western (i.e., inner) shore of the Bōsō Peninsula. 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, Kisarazu, Kimitsu, Futtsu, Kyonan, Tateyama, and Minamibōsō. The line is connected at both ends to the Sotobō Line. The name of the Uchibō Line in the Japanese language is formed from two kanji 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.

Line name	Station	Japanese	Distance (km)	to/from Keiyō Line	to/from Sōbu Line (Rapid)	Connecting lines	Location
				Rapid	Rapid
Sotobō Line	Chiba	千葉	From Chiba 0.0		●		Chūō-ku, Chiba
	Hon-Chiba	本千葉	1.4		●
	Soga	蘇我	3.8	●	●
Uchibō Line			From Soga 0.0
	Hamano	浜野	3.4	●	●
	Yawatajuku	八幡宿	5.6	●	●		Ichihara
	Goi	五井	9.3	●	●	Kominato Railway Kominato Line
	Anegasaki	姉ケ崎	15.1	●	●
	Nagaura	長浦	20.5	●	●		Sodegaura
	Sodegaura	袖ケ浦	24.4	●	●
	Iwane	巌根	27.5	●	| | |rowspan="2"|Kisarazu|-|Kisarazu|木更津|align="right"|31.3|style="text-align:center; background-color:MediumSeaGreen;" |●|style="text-align:center; background-color:Lavender;" |●| Kururi Line|-|Kimitsu|君津|align="right"|38.3|style="text-align:center; background-color:MediumSeaGreen;" |●|style="text-align:center; background-color:Lavender;" |●| |Kimitsu|-|Aohori|青堀|align="right"|42.0|style="text-align:center; background-color:MediumSeaGreen;" |●|rowspan="20"| | |rowspan="6"|Futtsu|-|Ōnuki|大貫|align="right"|46.6|style="text-align:center; background-color:MediumSeaGreen;" |●| |-|Sanukimachi|佐貫町|align="right"|50.7|style="text-align:center; background-color:MediumSeaGreen;" |●| |-|Kazusa-Minato|上総湊|align="right"|55.1|style="text-align:center; background-color:MediumSeaGreen;" |●| |-|Takeoka|竹岡|align="right"|60.2|rowspan="16"| | |-|Hamakanaya|浜金谷|align="right"|64.0| |-|Hota|保田|align="right"|67.5| |rowspan="2"|Kyonan, Awa District|-|Awa-Katsuyama|安房勝山|align="right"|70.8| |-|Iwai|岩井|align="right"|73.7| |rowspan="2"|Minami-Bōsō|-|Tomiura|富浦|align="right"|79.8| |-|Nako-Funakata|那古船形|align="right"|82.1| |rowspan="3"|Tateyama|-|Tateyama|館山|align="right"|85.9| |-|Kokonoe|九重|align="right"|91.7| |-|Chikura|千倉|align="right"|96.6| |rowspan="4"|Minami-Bōsō|-|Chitose|千歳|align="right"|98.6| |-|Minamihara|南三原|align="right"|102.2| |-|Wadaura|和田浦|align="right"|106.8| |-|Emi|江見|align="right"|111.4| |rowspan="3"|Kamogawa|-|Futomi|太海|align="right"|116.0| |-|Awa-Kamogawa|安房鴨川|align="right"|119.4| Sotobō Line (some through services)|} Notes: Special Rapid services were discontinued from 4 March 2017.^[1] Commuter Rapid services to/from Keiyo Line were discontinued from 16 March 2024.^[2] Operation The Uchibō Line operates local service with trains generally originating and terminating at Chiba Station. Trains headed directly for Tokyo Station merge with the Sotobō Line between Soga and Chiba Stations, and with the Sōbu Main Line between Chiba and Tokyo, while express and commuter trains merge with the Keiyō Line from Soga station. Local trains Daytime local service from Chiba to and (sometimes to) is provided by around 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 Keiyō Line 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), with some continuing onto the Yokosuka Line. Since the October 2004 timetable revision, all trains now stop at Nagaura and Sodegaura stations. Limited express trains The limited express train Sazanami runs from Tokyo Station 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 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 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

Notes and References

1. Web site: https://www.jreast.co.jp/chiba/news/pdf/pre1612_daikai.pdf. ja:2017年3月ダイヤ改正について. Timetable revision in March 2017. East Japan Railway Company. Japan. ja. 18 January 2017.
2. Web site: 京葉線で通勤快速列車の運転終了 . Commuter Rapid service on Keiyo Line ended . Japan Railfan Magazine Online . Koyusha Co., Ltd. . 14 April 2024 . Japan . Japanese . 16 March 2024.