Tobu 20000 series

Tobu 20000 series
20000 series, June 2008
In service	1988–
Manufacturer	Alna Kōki, Tokyu Car Corporation
Replaced	2000 series
Constructed	1988–1996
Number built	192 vehicles (24 sets)
Number in service	192 vehicles (24 sets)
Formation	8 cars per trainset
Operator(s)	Tobu Railway
Depot(s)	Kasukabe
Line(s) served	Tobu Skytree Line, Tobu Nikko Line, Tokyo Metro Hibiya Line
Specifications
Car body construction	Stainless steel
Car length	18,000 mm (59 ft 1 in)
Width	2,857 mm (9 ft 4.5 in)
Doors	3/5 pairs per side
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 line
Safety system(s)	Tobu ATS
Track gauge	1,067 mm (3 ft 6 in)

The Tobu 20000 series (東武20000系, Tōbu 20000-kei^?) is a commuter electric multiple unit (EMU) train type operated by the private railway operator Tobu Railway in Japan since 1988.

13 8-car sets (21801 to 21813) were built to replace the ageing 2000 series trains on inter-running services between the Tobu Skytree Line and the Tokyo Metro Hibiya Line in Tokyo, entering service on 25 March 1988. The body design uses a new lightweight corrugated stainless steel construction.

Total number of vehicles built: 104

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

Eight 8-car sets (21851 to 21858) were introduced on 29 December 1992 on Tobu Skytree Line and Tokyo Metro Hibiya Line inter-running services. These sets feature two 5-door cars at each end, and also LED destination indicators.

Total number of vehicles built: 64

The M5 and M7 cars are each fitted with one scissors type pantograph.

Three 8-car sets (21871 to 21873) were introduced from 25 March 1997 to cope with an increased service frequency. These sets feature 3-door cars throughout, and also LED destination indicators.

Total number of vehicles built: 24

The M1 and M3 cars are each fitted with one single-arm pantograph.