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Shiosai
Japanese limited express train service From Wikipedia, the free encyclopedia
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The Shiosai (しおさい) is a limited express train service in Japan operated by East Japan Railway Company (JR East). It runs from Tokyo and Shinjuku to Chōshi on the Bōsō Peninsula in Chiba Prefecture.
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Station stops
Shiosai services operate over the Sōbu Main Line, stopping at the stations listed below. All 7 round trips are operated daily except for one inbound trip which is not operated on Saturdays and holidays. No services operate as "Local" all-stations services in any section; this characteristic is different from that of Wakashio ltd.exp.[1][2][3]
Tokyo - Kinshichō - Chiba - Sakura - Yachimata - Narutō - Yokoshiba - Yōkaichiba - Asahi - Iioka - Chōshi
- No. 2, 4 & 13 trains also stop at Yotsukaidō station.
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Rolling stock
- E259 series 6-car EMUs (since 16 March 2024)[4]
- E257-500 series 5-car EMUs
Shiosai services are operated using Kamakura-based 6-car E259 series EMU and Makuhari-based 5-car E257-500 series EMU formations. The E257-500 series formations have no Green (first class) cars.[5][2]
Past rolling stock
- 183 series EMUs (10 March 1975 – 2005)
- 255 series 9-car EMUs (10 December 2005 – 15 March 2024)[4]
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Formations
Trains are formed as shown below, with car 1 at the Tokyo end.[2]
5+5-car E257 series (No. 4 only)
Past formations

Trains were originally formed of 9-car 183 series EMUs, including one Green car, or 6-car sets with no Green car,[6] but from December 1994, services were formed of 8-car 183 series sets with the Green car removed, as shown below.[7][8]
8-car 183 series
9-car 255 series
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History
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The Shiosai service was introduced from 10 March 1975 following the completion of electrification of the Sōbu Main Line in October 1974, using 9-car 183 series EMUs, replacing five of the seven daily diesel-powered Inubō (犬吠) express services that operated between Shinjuku/Ryōgoku and Chōshi.[8]
From the start of the November 1982 timetable revision, further 183 series EMUs were drafted in, displaced from Toki limited express services following the opening of the Joetsu Shinkansen,[9] and the remaining Inubō express services were discontinued and absorbed into the Shiosai services, giving seven return workings daily.[8]
From the start of the revised timetable on 10 December 2005, 255 series 9-car EMUs were introduced on Shiosai services.[10] From the same date, services were made entirely no-smoking.[10]
From the start of the 14 March 2015 timetable revision, all Shiosai services started and terminated at Tokyo Station, with no services operating from Shinjuku.[11]
From the start of the 16 March 2024 timetable revision, E259 series 6-car EMUs used on Narita Express services are scheduled to also be used on Shiosai services for six return trips. Meanwhile, E257 series trains in 5-car formations will continue to be used for one return trip. As a result, 255 series sets will no longer operate on these services.[4]
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See also
References
External links
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