Tobu 9000 series

Tobu 9000/9050 series
Refurbished set 9106, October 2021
Manufacturer	Tokyu Car Corporation, Fuji Heavy Industries, Alna Koki
Constructed	1981–1994
Entered service	1981
Refurbished	2007–2008
Number built	100 vehicles (10 sets)
Number in service	90 vehicles (9 sets)
Formation	10 cars per trainset
Operators	Tobu Railway
Depots	Shinrinkōen
Lines served	TJ Tobu Tojo Line Y Tokyo Metro Yurakucho Line F Tokyo Metro Fukutoshin Line TY Tokyu Toyoko Line Minatomirai Line
Specifications
Car body construction	Stainless steel
Car length	20 m (65 ft 7 in)
Maximum speed	110 km/h (68 mph)
Traction system	Thyristor chopper (9101–9108) GTO–VVVF (9151 & 9152)
Power output	150 kW (201 hp) per motor
Transmission	Cardan shaft 87:16 (5.43) gear ratio (9000 series) 87:14 (6.21) gear ratio (9050 series)[citation needed]
Acceleration	3.3 km/(h⋅s) (2.1 mph/s)
Deceleration	3.7 km/(h⋅s) (2.3 mph/s) (service) 4.5 km/(h⋅s) (2.8 mph/s) (emergency)
Electric system(s)	1,500 V DC
Current collector(s)	Overhead lines
Track gauge	1,067 mm (3 ft 6 in)

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