| Seibu 10000 series New Red Arrow | |
|---|---|
 10000 series on aKoedo service in October 2023 | |
| Manufacturer | Hitachi |
| Replaced | 5000 series |
| Constructed | 1993–2003 |
| Entered service | 6 December 1993 |
| Refurbished | 2003–2008 |
| Number built | 84 vehicles (12 sets) |
| Number in service | 84 vehicles (12 sets) |
| Successor | Seibu 001 series |
| Formation | 7 cars per trainset |
| Operators | Seibu Railway |
| Depots | Kotesashi, Minami-Iriso |
| Lines served | |
| Specifications | |
| Car length | 20 m (65 ft 7 in) |
| Doors | One per side |
| Maximum speed | 105 km/h (65 mph) |
| Traction system | Resistor control Variable frequency (3-levelIGBT) (set 10112) |
| Electric system(s) | 1,500 V DC |
| Current collection | Overhead line |
| Braking system(s) | Dynamic braking |
| Track gauge | 1,067 mm (3 ft 6 in) |
TheSeibu 10000 series (西武10000系) is anelectric multiple unit (EMU) train type operated by the private railway operatorSeibu Railway onlimited express services in the Tokyo area of Japan since 1993.[1]
Branded as "NRA" or "New Red Arrow", the trains are used onKoedo services fromSeibu-Shinjuku in Tokyo toHon-Kawagoe. They were formerly also used onMusashi andChichibu services fromIkebukuro in Tokyo toHannō andSeibu-Chichibu stations.[1]
As of 1 April 2012, the fleet consists of 12 7-car sets, formed as follows.[2]
| Car No. | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
|---|---|---|---|---|---|---|---|
| Designation | Tc1 | M1 | M2 | T | M3 | M4 | Tc2 |
| Numbering | 10100 | 10200 | 10300 | 10400 | 10500 | 10600 | 10700 |
Cars 2, 5, and 6 each have one single-arm pantograph, except set 10112, which has pantographs on cars 2 and 5 only.[2]
The first two trains delivered were introduced in December 1993 onKoedo services fromSeibu-Shinjuku in Tokyo toHon-Kawagoe, replacing the former5000 seriesRed Arrow trains.[3]
A further three trainsets were delivered in 1994 and introduced onChichibu services fromIkebukuro in Tokyo toSeibu-Chichibu on 15 October 1994.[3]
The trains were refurbished internally between 2003 and 2008, and the old seats were re-used inChichibu Railway 6000 series andIzukyu 8000 series trainsets.[4]
On 13 March 2020, the 10000 series trainsets were withdrawn from Ikebukuro Line andChichibu Line limited express services,[5] being replaced by001 seriesLaview trainsets. Since then, the fleet of 10000 series has been used on limited express service on theSeibu Shinjuku Line.[6]
Three cars were transferred to theToyama Chihō Railway in October 2020. After spending 2021 undergoing preparation, they entered service on 19 February 2022.[7]
The sets are monoclass with 2+2 abreast reclining seating. Seat pitch is 1,070 mm (42 in).[4]
Seibu Railway trainsets | ||
|---|---|---|
| Commuter EMUs |  | |
| Limited express EMUs | ||
| Future EMUs | ||
| Withdrawn EMUs | ||
| Locomotives | ||