Shiosai services operate over the Sōbu Main Line, stopping at the stations listed below. No services operate as "Local" all-stations services in any section; this characteristic is different from that of Wakashio ltd.exp..[1][2][3]
Shiosai services are operated using Makuhari-based 9-car 255 seriesEMU and 10-car E257-500 series EMU formations. The E257-500 series formations have no Green (first class) cars.[4][2]
Trains are formed as shown below, with car 1 at the Tokyo end.[1][5]
9-car 255 series
Car No.
1
2
3
4
5
6
7
8
9
Numbering
KuHa 254
MoHa 254
MoHa 255
SaRo 255
SaHa 254
SaHa 255
MoHa 254
MoHa 255
KuHa 255
Accommodation
Non-reserved
Non-reserved
Non-reserved
Green
Reserved
Non-reserved
Non-reserved
Non-reserved
Non-reserved
As of 2019, cars no. 2 and 3 are reserved on some services.[2]
5+5-car E257 series
Car No.
1
2
3
4
5
6
7
8
9
10
Numbering
KuHa E256-500
MoHa E257-1500
MoHa E256-500
MoHa E257-500
KuHa E257-500
KuHa E256-500
MoHa E257-1500
MoHa E256-500
MoHa E257-500
KuHa E257-500
Accommodation
Non-reserved
Non-reserved
Non-reserved
Non-reserved
Non-reserved
Non-reserved
Reserved
Non-reserved
Non-reserved
Non-reserved
Past formations
183 series EMU on a Shiosai service, May 2005
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
Car No.
1
2
3
4
5
6
7
8
Accommodation
Reserved
Reserved
Non-reserved
Non-reserved
Non-reserved
Non-reserved
Non-reserved
Non-reserved
History
165 series EMU on a special Inubō revival working in November 2002
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.[5] From the same date, services were made entirely no-smoking.[5]
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.[10]
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