| Seibu 20000 series | |
| Imagealt: | Blue train |
| Service: | 2000–present |
| Manufacturer: | Hitachi |
| Factory: | Kudamatsu, Yamaguchi |
| Family: | Hitachi A-train |
| Yearconstruction: | 1999–2005 |
| Yearservice: | 2000 |
| Numberbuilt: | 144 vehicles (16 sets) |
| Numberservice: | 144 vehicles (16 sets) |
| Formation: | 8/10 cars per trainset |
| Operator: | Seibu Railway |
| Depots: | Kotesashi, Minami-Iriso, Musashigaoka, Tamagawa-Josui |
| Carbody: | Aluminium |
| Carlength: | 20000mm |
| Doors: | 4 pairs per side |
| Maxspeed: | 105round=5NaNround=5 |
| Traction: | Variable frequency (IGBT) |
| Electricsystem: | 1,500 V DC |
| Collectionmethod: | overhead catenary |
The is an electric multiple unit (EMU) train type operated by the private railway operator Seibu Railway on commuter services in the Tokyo area of Japan. First introduced in 2000,[1] a total of eight 10-car sets and eight 8-car sets were built between 1999 and 2005 by Hitachi for use on Seibu Ikebukuro Line and Seibu Shinjuku Line services.
, the fleet consists of eight ten-car sets and eight eight-car (20050 series) sets, based at Kotesashi, Minami-Iriso, Musashigaoka, and Tamagawa-Josui depots for use on Seibu Shinjuku Line and Seibu Ikebukuro Line services.[2]
The eight-car sets (20151 to 20158) are formed as shown below with four motored (M) cars and four unpowered trailer (T) cars, and car 8 at the Shinjuku/Ikebukuro end.[2]
| Car No. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
|---|---|---|---|---|---|---|---|---|---|
| Designation | Tc1 | M1 | M2 | T1 | T3 | M5 | M6 | Tc2 | |
| Numbering | 2015x | 2025x | 2035x | 2045x | 2075x | 2085x | 2095x | 2005x |
The M1 and M5 cars are each equipped with one single-arm pantograph.[2]
The eight ten-car sets (20101 to 20108) are formed as shown below with five motored (M) cars and five unpowered trailer (T) cars, and car 10 at the Shinjuku/Ikebukuro 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 | 2010x | 2020x | 2030x | 2040x | 2050x | 2060x | 2070x | 2080x | 2090x | 2000x |
The M1, M3, and M5 cars are each equipped with one single-arm pantograph.[2]
Seating consists of sculpted longitudinal bench seating throughout, with an individual seat width of 460mm per person.[1] Wheelchair spaces are provided in the two outermost cars at each end.[2] Priority seats are provided at the end of each car.[2] Scrolling LED passenger information displays are provided above the doorways.[1]
The first train was built in 1999, undergoing test running before entering revenue service in 2000.[1]
In August 2015, set 20101 was modified with full-colour LED destination indicators replacing the original three-colour LED type.[3]
From 8 October 2016, eight-car set 20158 operated in a special Galaxy Express 999 vinyl wrapping livery.[4] It is scheduled to operate in this livery until March 2019.[4]
From 15 January 2018, two ten-car sets, 20104 and 20105, are scheduled to operate in a special "L-train" livery consisting of the Saitama Seibu Lions baseball team colour of dark blue with Seibu Lions logos.[5] From January 2022, the two sets' liveries were updated to depict 20 active players instead of the previous combination of veteran and current players. The sets re-entered service on the Shinjuku, Haijima, Ikebukuro, and Sayama lines from then.[6] [7]