Seibu 10000 series

Seibu 10000 series
10000 series on a Chichibu service in June 2008
Replaced	5000 series
Constructed	1993–2003
Entered service	December 1993
Refurbishment	2003–2008
Number built	84 vehicles (12 sets)
Number in service	84 vehicles (12 sets)
Formation	7 cars per trainset
Operator(s)	Seibu Railway
Depot(s)	Kotesashi, Minami-Iriso
Line(s) served	Seibu Ikebukuro Line, Seibu Shinjuku Line
Specifications
Car length	20 m (65 ft 7 in)
Doors	One per side
Maximum speed	105 km/h (65 mph)
Traction system	Resistor control IGBT-VVVF (set 10112)
Electric system(s)	1,500 V DC
Current collection method	Overhead line
Braking system(s)	Dynamic braking
Track gauge	1,067 mm (3 ft 6 in)

The Seibu 10000 series (西武10000系^?) is an electric multiple unit (EMU) train type operated by the private railway operator Seibu Railway on limited express services in the Tokyo area of Japan since 1993.

Branded as "NRA" or "New Red Arrow", the trains are used on Koedo services from Seibu-Shinjuku in Tokyo to Hon-Kawagoe and on Musashi and Chichibu services from Ikebukuro in Tokyo to Hannō and Seibu Chichibu Station.

As of 1 April 2012, the fleet consists of 12 7-car sets, formed as follows.

Cars 2, 5, and 6 each have one single-arm pantograph, except set 10112, which has pantographs on cars 2 and 5 only.

The first two trains delivered were introduced in December 1993 on Koedo services from Seibu-Shinjuku in Tokyo to Hon-Kawagoe, replacing the former 5000 series Red Arrow trains.

A further three trainsets were delivered in 1994 and introduced on Chichibu services from Ikebukuro in Tokyo to Seibu-Chichibu on 15 October 1994.

The trains were refurbished internally between 2003 and 2008, and the old seats were re-used in Chichibu Railway 6000 series and Izukyu 8000 series trainsets.

The sets are monoclass with 2+2 abreast reclining seating. Seat pitch is 1,070 mm (42 in).

Original seating in September 2006

Interior view showing new seating in January 2009

New seating in September 2006