S-Train (Seibu)

The S-Train is a reserved-seat Commuter Liner train service operated mainly by Seibu Railway, along with Tokyo Metro, Tokyu Corporation, and Yokohama Minatomirai Railway.

S-Train

S-Train logo, and the Seibu 40000 series used on S-Train services
Overview
Service type	Seat Reserved Commuter Liner
Status	In service
Locale	Tokyo, Saitama, Kanagawa
First service	25 March 2017
Current operator(s)	Seibu Railway Tokyo Metro Tokyu Corporation Yokohama Minatomirai Rwy.
Route
Termini	Tokorozawa (Weekdays) Seibu-Chichibu (Weekends) Toyosu (Weekdays) Motomachi-Chukagai (Weekends)
Line(s) used	Seibu Railway Yurakucho Line Ikebukuro Line Chichibu Line Tokyo Metro Yurakucho Line Fukutoshin Line Tokyu Corporation Toyoko Line Yokohama Minatomirai Railway Minatomirai Line
On-board services
Class(es)	Standard class only
Seating arrangements	Reserved seats
Technical
Rolling stock	Seibu 40000 series EMUs
Track gauge	1,067 mm (3 ft 6 in)
Electrification	1,500 V DC overhead
Route map

Summary

S-Train service was first announced by the four operating companies on 16 June 2016,^[1] with further details being given on 10 January 2017.^[2] The service is centered on Seibu Railway, and uses their 40000 series trains. Within the four operating companies, the S-Train is the first-ever reserved-seat train to operate on the Tokyu and Minatomirai railways.^[3]

The name "S-Train" was used by the 4 companies during trademark registration on 21 November 2016, and has been trademarked since 21 April 2017 (No. 5941839). The "S" in "S-Train" stands for the following:^[2]

• Scene: Used in different scenarios, like commuting to work, going to school or going on outings
• Seat: Comfortable reserved seats
• Seamless: Seamless journey thanks to through service without interchange
• Seibu

The logo has three different colours, each with unique meanings. The upper part of the "S" is coloured green, signifying the greenery alongside the Chichibu Line; the lower part of the "S" is coloured blue, signifying the Minatomirai Line, whose signature colour is also blue; and the text "S-TRAIN" is grey, signifying the urbanisation around Shibuya and Toyosu, which the train serves.^[2]

In terms of service type, the S-Train is uniquely positioned. It is positioned lower than Seibu's limited express (the Red Arrow) on the Seibu service hierarchy, but is placed higher than Tokyu's limited express (which does not charge extra fees) in Tokyu's service hierarchy.

Services

Train operation differs between weekdays and weekends.

The direction is denoted by "Up" and "Down", where trains for Toyosu or Motomachi-Chukagai are "up" and trains for Chichibu or Tokorozawa are "down". This is based on Seibu's standards, in which southbound services are "up", and northbound services are "down". The S-Train follows Seibu's standards because it is the main operator of the service. A further reason for using Seibu's standards is to prevent confusion, as Tokyo Metro and Tokyu use reversed denotations of service direction compared to Seibu.

Since all seats on the S-Train are reserved, there are special conductors (specially called "Train Crew" within Tokyu sections) to make sure passengers have purchased seat reservations. Because of this, the S-Train differs from regular Tokyo Metro services, as all S-Train services use driver-only operation.^{[citation needed]}

Weekdays

On weekdays, S-Trains operate mainly to serve commuters. They run between Tokorozawa and Toyosu, on the Seibu Ikebukuro and Yurakucho Lines, and the Tokyo Metro Yurakucho Line.

There are 6 Toyosu-bound trains and 5 Tokorozawa-bound trains every weekday. S-Trains operate during the evening rush hours, except for one Toyosu-bound train which operates in early morning.

The biggest feature of the weekday S-Trains is that it skips Ikebukuro Station, which is a core transfer terminal on the Seibu Ikebukuro and Tokyo Metro Yurakucho Lines, and is Tokyo Metro's busiest station. Another feature is that it operates as a limited stop service within the Tokyo Metro Yurakucho Line.

S-Trains stop at Tokorozawa, Hoya, Shakujii-Koen on the Seibu Ikebukuro Line, and at Iidabashi, Yurakucho, Toyosu on the Tokyo Metro Yurakucho Line.

Weekends

On weekends, S-Train services operate mainly to serve visitors. They run between Seibu-Chichibu and Motomachi-Chukagai, on the Seibu Chichibu and Yurakucho Lines, the Tokyo Metro Fukutoshin Line, the Tokyu Toyoko Line, and the Minatomirai Line. The section is 113.8 kilometres (70.7 mi) long, which is the longest distance of any Tokyo Metro through train service.

There are 2 southbound trains (one originating from Seibu-Chichibu, the other from Hanno, all for Motomachi-Chukagai), and 3 northbound trains (one to Tokorozawa, one to Hanno, and one for Seibu-Chichibu, all originating from Motomachi-Chukagai) per day on weekends.

The southbound train from Hanno and the northbound train to Seibu-Chichibu are the only weekend S-Trains that operate in the morning. All other S-Trains operate in the evening.

Passengers cannot board S-Trains at Ikebukuro.

Stations served

Weekdays

Legend

• ◯ : Stops
• △ : Stops, boarding for northbound trains only
• ▽ : Stops, boarding for southbound trains only
• ◇ : Stops, alighting only
• ※ : Brief stop, no boarding or alighting

Route	Station			S-Train	Connections and Notes
	Station No.	Name	Japanese
Seibu Ikebukuro Line System[* 1]	SI19	Kotesashi	小手指	◇
	SI18	Nishi-Tokorozawa	西所沢	◇
	SI17	Tokorozawa	所沢	▽	Seibu Shinjuku Line (SS22)
	SI12	Hoya	保谷	▽
	SI10	Shakujii-Kōen	石神井公園	▽
	SI06	Nerima	練馬	◇	(Brief stop to switch between ATS and ATC systems)
	SI37Y06	Kotake-Mukaihara	小竹向原	※	(Brief stop to switch crew members)
Tokyo Metro Yurakucho Line
	Y13	Iidabashi	飯田橋	△	T Tokyo Metro Tōzai Line (T-06) N Tokyo Metro Namboku Line (N-10) E Toei Ōedo Line (E-06) JB JR East Chūō-Sōbu Line (JB 16)
	Y18	Yurakucho	有楽町	△	H Tokyo Metro Hibiya Line (H-07 at Hibiya Station) C Tokyo Metro Chiyoda Line (C-09 at Hibiya Station) I Toei Mita Line (I-08 at Hibiya Station) JY JR East Yamanote Line (JY 30)・JK Keihin-Tohoku Line (JK 25)
	Y22	Toyosu	豊洲	◯	Yurikamome (U-16)

Weekends

Legend

• ◯ : Stops
• △ : Stops, boarding for northbound trains only
• ▽ : Stops, boarding for southbound trains only
• ◇ : Stops, alighting only
• ※ : Brief stop, no boarding or alighting

Route	Station			S-Train	Connections and Notes
	Station No.	Name	Japanese
Seibu Ikebukuro Line System[* 2]	SI36	Seibu-Chichibu	西武秩父	◯	Chichibu Railway (Ohanabatake Station)
	SI26	Hanno	飯能	◯
	SI23	Irumashi	入間市	◯
	SI17	Tokorozawa	所沢	◯	Seibu Shinjuku Line (SS22)
	SI10	Shakujii-Kōen	石神井公園	◯
	SI06	Nerima	練馬	※	(Brief stop to switch between ATS and ATC systems)
	SI37F06	Kotake-Mukaihara	小竹向原	※	(Brief stop to switch crew members)
Tokyo Metro Fukutoshin Line
	F09	Ikebukuro	池袋	◇	M Tokyo Metro Marunouchi Line (M-25) Y Tokyo Metro Yurakucho Line (Y-09) JY JR East Yamanote Line (JY 13) JA JR East Saikyo Line (JA 12)・JS Shonan-Shinjuku Line (JS 21) TJ Tobu Tojo Line (TJ-01) Seibu Ikebukuro Line (SI01)
	F13	Shinjuku-sanchome	新宿三丁目	◯	M Tokyo Metro Marunouchi Line (M-09) S Toei Shinjuku Line (S-02)
	F16TY01	Shibuya	渋谷	◯	G Tokyo Metro Ginza Line (G-01)・ Z Hanzomon Line (Z-01) JY JR East Yamanote Line (JY 20) JA JR East Saikyo Line (JA 10)・JS Shonan-Shinjuku Line (JS 19) DT Tokyu Den-en Toshi Line (DT01) Keio Inokashira Line (IN01)
Tokyu Toyoko Line
	TY03	Naka-Meguro	中目黒	※	(Brief stop)
	TY07	Jiyugaoka	自由が丘	◯	OM Tokyu Oimachi Line (OM10)
	TY11	Musashi-Kosugi	武蔵小杉	※	(Brief stop)
	TY16	Kikuna	菊名	※	(Brief stop)
	TY21	Yokohama	横浜	△	JT JR East Tokaido Line (JT 05)・ JO Yokosuka Line (JO 13)・JS Shonan-Shinjuku Line (JS 13) JK JR East Keihin-Tohoku Line (JK 12)・JK Negishi Line (JK 12)・ JH Yokohama Line (JH 12) KK Keikyu Main Line (KK37) Sotetsu Main Line (SO01) Yokohama Municipal Subway Blue Line (B20)
Minatomirai Line
		Minatomirai	みなとみらい	△
		Motomachi-Chukagai	元町・中華街 （山下公園）	◯

1. Kotesashi - Nerima：Seibu Ikebukuro Line, Nerima to Kotake-Mukaihara：Seibu Yurakucho Line
2. Seibu-Chichibu - Agano：Seibu Chichibu Line, Agano - Nerima：Seibu Ikebukuro Line, Nerima - Kotake-Mukaihara：Seibu Yurakucho Line

Rolling stock

• Seibu 40000 series 10-car EMUs

• 
  Interior of a 40000 series S-Train carriage, with transverse seat configuration

See also

• F Liner, a similar service to the weekend S-Train