Seibu 40000 series
Japanese electric multiple unit train type
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The Seibu 40000 series (西武40000系) is a commuter electric multiple unit (EMU) train type operated by the private railway operator Seibu Railway in Japan since March 2017.[1] As of March 2025,[update] a total of 20 ten-car trainsets and 3 eight-car trainsets have been built by Kawasaki Heavy Industries in Kobe from 2016, with the first trains entering service on 25 March 2017.[2]
| Seibu 40000 series | |
|---|---|
40000 series set 40104 in October 2023 | |
| In service | 2017–present |
| Manufacturers | Kawasaki Heavy Industries, Kawasaki Railcar Manufacturing |
| Built at | Kobe, Hyōgo |
| Family name | efACE |
| Replaced | 2000 series |
| Constructed | 2016– |
| Entered service | 25 March 2017 |
| Number built | 224 vehicles (23 sets) |
| Formation | 8/10 cars per trainset |
| Fleet numbers |
|
| Operator |  Seibu Railway |
| Lines served | |
| Specifications | |
| Car body construction | Aluminium alloy |
| Car length |
|
| Width | 2,848 mm (9 ft 4.1 in) |
| Height | 4,050 mm (13 ft 3 in) |
| Doors | 4 pairs per side |
| Maximum speed | 120 km/h (75 mph) |
| Traction system | Toshiba 2-level IGBT–VVVF |
| Traction motors | 20 × 190 kW (255 hp) permanent-magnet synchronous motor[1] |
| Power output | 3.8 MW (5,096 hp) |
| Acceleration | 3.3 km/(h⋅s) (2.1 mph/s) |
| Deceleration |
|
| Electric systems | 1,500 V DC Overhead catenary |
| Current collection | Pantograph |
| UIC classification | 2'2' + Bo'Bo' + Bo'Bo' + 2'2' + Bo'Bo' + 2'2' + 2'2' + Bo'Bo' + Bo'Bo' + 2'2' |
| Bogies | SS185 |
| Track gauge | 1,067 mm (3 ft 6 in) |
Design
The new 40000 series trains were built by Kawasaki Heavy Industries in Kobe from January 2016, with deliveries scheduled to continue from fiscal 2016 to 2019.[3] This is the first time that trains for Seibu Railway have been built by this manufacturer.[3]
The new trains are designed as an evolution of the 30000 series "Smile Train" concept, and are intended to be passenger-friendly.[1]
Operations
The 40000 series trains operate on Seibu Ikebukuro Line, Seibu Shinjuku Line, and Seibu Haijima Line services.[4] Some trainsets operate on reserved-seat supplementary-fare S-Train services between the Seibu Ikebukuro Line and Tokyo Metro Yurakucho Line on weekdays and between the Seibu Chichibu Line and Minatomirai Line (via the Tokyo Metro Fukutoshin Line and Tōkyū Tōyoko Line) at weekends since 25 March 2017.[5][6]
Formation
The 40000 series EMUs are ten-car sets formed as follows, with five motored ("M") cars and five non-powered trailer ("T") cars, and car 1 at the Hanno (i.e. northern) end.[2]
| Car No. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Designation | Tc1 | M1 | M2 | T1 | M3 | T2 | T3 | M5 | M6 | Tc2 |
| Numbering | 4010x | 4020x | 4030x | 4040x | 4050x | 4060x | 4070x | 4080x | 4090x | 4000x |
| Weight (t) | 29.5 | 36.9 | 35.0 | 28.2 | 34.6 | 26.7 | 27.2 | 37.0 | 34.8 | 28.6 |
| Capacity (total/seated) longitudinal config. |
124/38 | 132/45 | 132/48 | 126/42 | 132/48 | 132/48 | 132/48 | 132/48 | 132/45 | 125/30 |
| Capacity (total/seated) transverse config. |
119/38 | 127/45 | 127/48 | 121/42 | 127/48 | 127/48 | 127/48 | 127/48 | 127/45 | 121/30 |
Cars 2, 5, and 8 each have one single-arm pantograph.[2] Car 4 has a universal access toilet.[2]
40050 subseries
Due to the use of fixed longitudinal seating throughout, the 40050 subseries EMUs are slightly lighter and accommodate more passengers than the 40000 series trains.[7]
| Car No. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|---|---|
| Designation | Tc1 | M1 | M2 | T1 | M3 | T2 | T3 | M5 | M6 | Tc2 |
| Numbering | 4015x | 4025x | 4035x | 4045x | 4055x | 4065x | 4075x | 4085x | 4095x | 4005x |
| Weight (t) | 28.2 | 35.9 | 33.5 | 24.8 | 33.0 | 25.4 | 25.5 | 35.8 | 33.4 | 27.9 |
| Capacity (total/seated) | 135/45 | 146/51 | 146/51 | 146/51 | 146/51 | 146/51 | 146/51 | 146/51 | 146/51 | 136/31 |
Cars 2, 5, and 8 each have one single-arm pantograph.[7]
Interior
The trains' interiors use LED lighting, and pairs of LCD passenger information screens are provided both above the doorways and suspended form the ceilings.[2] A "Partner zone" area is provided at the end of car 10 with perch seats and space for wheelchairs and large luggage.[2] This area also has larger windows.[2] "Plasmacluster" air-purification technology is used for the first time on Seibu Railway trains.[4]
40000 series
Passenger accommodation consists primarily of rotating pairs of seats can be arranged in either longitudinal or transverse arrangements, known as "LONG/CROSS" seats.[1]
The interior of a 40000 series set in March 2022 with seating in transverse configuration
Three-person seating at the end of a car in March 2022
The "Partner zone" standing area in car 10 in April 2017
The train toilet in April 2017
"LONG/CROSS" label beside destination LED on the exterior of the train, showing that the seat is rotational
40050 series
Passenger accommodation consists of fixed longitudinal bench seating throughout.[8] These seats are referred to as "LONG" seats.
Interior view
7-person bench seat
3-person seat
History
Details of the new trains were officially announced in August 2015.[1] The first trainset, 40101, was delivered from the Kawasaki Heavy Industries factory in Kobe to Seibu's Kotesashi Depot in September 2016.[9]
The first sets entered revenue service on S-Train services on 25 March 2017.[10]
From spring 2018, 40000 series trains are scheduled to be used on new Haijima Liner (拝島ライナー) limited-stop supplementary-fare commuter services operating from Seibu-Shinjuku to Haijima on weekday evenings.[11]
In 2019, Seibu announced plans to procure two new 40000 series trainsets.[12] These sets, numbered 40151 and 40152, were built with fixed longitudinal bench seating throughout instead of rotating seats found in older sets.[8] Two additional sets with fixed longitudinal seating were announced in 2020 as part of the operator's investment plan for fiscal 2020,[13] followed by another three for 2021.[14] By November 2023, fourteen 40000 series sets with fixed longitudinal seating had been built.[15]
In May 2024, Seibu announced plans to build three new eight-car sets as part of its fiscal 2024 capital investment plan.[16] The first eight-car set, 48151, was delivered in December 2024.[17]
Tokiiro
In February 2026, Seibu announced that it would introduce 8-car trains based on the 40000 series design, branded Tokiiro (トキイロ), to replace the 10000 series fleet on Shinjuku Line limited-express services. Four sets are scheduled to be introduced by the first quarter of 2027. Internally, the trains will feature rotating pairs of reclining seats throughout, and every seat will be equipped with power outlets, and cup holders. Seibu estimated that the new trains would be 17% lighter and offer 70% energy savings over the 10000 series.[18][19]
Build histories
The manufacturers and delivery dates for the fleet are as shown below.[10]
10-car sets
| Set No. | Manufacturer | Date delivered |
|---|---|---|
| 40101 | Kawasaki Heavy Industries | 10 January 2017[Note 1] |
| 40102 | 11 January 2017[Note 1] | |
| 40103 | October 2017[20] | |
| 40104 | November 2017[21] | |
| 40105 | January 2018[22] | |
| 40106 | February 2018[23] | |
| 40151 | 2019[8] | |
| 40152 | 2020[24] | |
| 40153 | 2020[25] | |
| 40154 | 2020[26] | |
| 40155 | June 2021[27] | |
| 40156 | ||
| 40157 | Kawasaki Railcar Manufacturing | 2021[28] |
| 40158 | June 2022[29] | |
| 40159 | 2023[30] | |
| 40160 | 2023[31] | |
| 40161 | 2023[32] | |
| 40162 | 2023[33] | |
| 40163 | 2023[34] | |
| 40164 | 2023[15] |
8-car sets
| Set No. | Manufacturer | Date delivered |
|---|---|---|
| 48151 | Kawasaki Railcar Manufacturing | December 2024[17] |
| 48152 | February 2025[35] | |
| 48153 | March 2025[36] | |
| 48154 | ||
| 48155 | Kawasaki Railcar Manufacturing | September 2025[37] |
- Notes
- Official acceptance date.
See also
- Tobu 50090 series and 70090 series, Tobu Railway commuter EMU types that also features rotating longitudinal/transverse seating
- Keio 5000 series, a Keio commuter EMU type that also features rotating longitudinal/transverse seating
- Keikyu 2100 series, a Keikyu commuter EMU type that also features transverse seating
- Keikyu N1000 series, another Keikyu commuter EMU type also features rotating transverse seating (batch 20 only)
