Tobu 9000 series

Tobu 9000 series
Refurbished set 9105, July 2008
In service	1981–Present
Manufacturer	Tokyu Car Corporation, Fuji Heavy Industries, Alna Koki
Constructed	1981–1994
Refurbishment	2007–2008
Number built	100 vehicles (10 sets)
Formation	10 cars per trainset
Operator(s)	Tobu Railway
Depot(s)	Shinrinkōen
Line(s) served	Tobu Tojo Line, Tokyo Metro Yurakucho Line, Tokyo Metro Fukutoshin Line
Specifications
Car body construction	Stainless steel
Car length	20 m (65 ft 7 in)
Maximum speed	110 km/h (70 mph)
Acceleration	3.3 km/h/s
Deceleration	3.7 km/h/s (service) 4.5 km/h/s (emergency)
Electric system(s)	1,500 V DC
Current collection method	Overhead lines
Track gauge	1,067 mm (3 ft 6 in)

The Tobu 9000 series (東武9000系, Tōbu 9000-kei^?) is a commuter electric multiple unit (EMU) train type operated by the private railway operator Tobu Railway in Japan since 1981.

First entering service in 1981 on the Tobu Tojo Line, this was the first stainless steel EMU type to be introduced by Tobu. A total of ten 10-car sets were ultimately built for use on through-running services over the Tokyo Metro Yurakucho Line and Tokyo Metro Fukutoshin Line, as well as Tojo Line services between Ikebukuro and Ogawamachi.

Built in October 1981, this was the first stainless steel EMU type to be introduced by Tobu, and featured a bodyline stripe using the same "Royal maroon" colour as previously used on Tobu 1720 series "DRC" trains. Set 9101 was built jointly by three manufacturers, with four cars (9101 - 9401) built by Tokyu Car Corporation, two cars (9501 - 9601) by Fuji Heavy Industries, and four cars (9701 - 9001) by Alna Koki (now Alna Sharyo).

The seats on this set were originally brown, but this was later changed to the standard light green colour.

The M1 cars are each fitted with one scissors type pantograph.

Sets 9102 to 9107 were built in 1987, incorporating a number of minor improvements over the prototype set. Seat width was increased from 425 mm to 450 mm.

An additional set, 9108, was built in 1991, based on the 10030 series lightweight body style.

The M1 cars are each fitted with one single-arm pantograph.

First refurbished set, 9102, April 2007