Seibu 40000 series

Seibu 40000 series
Seibu 40000 series
	40000 series set 40104 in October 2023
In service	2017–present
Manufacturer	Kawasaki Heavy Industries, Kawasaki Railcar Manufacturing
Built at	Kobe, Hyōgo
Family name	efACE
Replaced	2000 series
Constructed	2016–
Entered service	25 March 2017
Number built	224 vehicles (23 sets)
Formation	8/10 cars per trainset
Fleet numbers	40101–40106, 40151–40164 (10-car sets); 48151–48153 (8-car sets);
Operators	Seibu
Lines served	Seibu Chichibu Line; Seibu Ikebukuro Line; Seibu Shinjuku Line; Seibu Haijima Line; Y Tokyo Metro Yurakucho Line; F Tokyo Metro Fukutoshin Line; TY Tokyu Toyoko Line; Minatomirai Line;
Specifications
Car body construction	Aluminium alloy
Car length	20,270 mm (66 ft 6 in) (end cars); 20,000 mm (65 ft 7 in) (intermediate cars);
Width	2,848 mm (9 ft 4.1 in)
Height	4,050 mm (13 ft 3 in)
Doors	4 pairs per side
Maximum speed	120 km/h (75 mph)
Traction system	Toshiba 2-level IGBT–VVVF
Traction motors	20 × 190 kW (255 hp) permanent-magnet synchronous motor
Power output	3.8 MW (5,096 hp)
Acceleration	3.3 km/(h⋅s) (2.1 mph/s)
Deceleration	3.5 km/(h⋅s) (2.2 mph/s) (service); 4.5 km/(h⋅s) (2.8 mph/s) (emergency);
Electric system(s)	1,500 V DC Overhead catenary
Current collector(s)	Pantograph
UIC classification	2'2' + Bo'Bo' + Bo'Bo' + 2'2' + Bo'Bo' + 2'2' + 2'2' + Bo'Bo' + Bo'Bo' + 2'2'
Bogies	SS185
Track gauge	1,067 mm (3 ft 6 in)

The Seibu 40000 series (西武40000系) is a commuter electric multiple unit (EMU) train type operated by the private railway operator Seibu Railway in Japan since March 2017. As of March 2025, a total of 20 ten-car trainsets and 3 eight-car trainsets have been built by Kawasaki Heavy Industries in Kobe from 2016, with the first trains entering service on 25 March 2017.