Osaka Municipal Subway New 20 series

The Osaka Municipal Subway New 20 series (大阪市交通局新20系) is a rapid transit electric multiple unit (EMU) train type operated by Osaka Municipal Subway in Japan since 1990.

Osaka Municipal Subway New 20 series
In service	1990–present
Manufacturer	Alna Kōki, Hitachi, Kawasaki Heavy Industries, Kinki Sharyo, Nippon Sharyo, Tokyu Car Corporation
Replaced	30 series
Constructed	1990–1998
Refurbished	2011–
Number built	572 vehicles
Number in service	572 vehicles
Formation	10 cars per trainset (21 series) 6 cars per trainset (22/23/24/OTS series) 4 cars per trainset (25 series)
Operator(s)	Osaka Municipal Subway (1990-2018) Osaka Metro(2018-)
Depot(s)	Nakamozu (21 series) Dainichi (22 series) Midorigi (23 series) Morinomiya (24/25/OTS series)
Line(s) served	Midōsuji Line Tanimachi Line Yotsubashi Line Chūō Line Sennichimae Line Kitakyū Namboku Line Kintetsu Keihanna Line
Specifications
Car body construction	Stainless steel
Train length	187,400 mm (614.8 ft) (21 series) 112,600 mm (369.4 ft) (22/23/24/OTS series) 75,200 mm (246.7 ft) (25 series)
Car length	18,900 mm (62 ft 0 in) (end cars) 18,700 mm (61 ft 4 in) (intermediate cars)
Width	2,890 mm (9 ft 6 in) (end cars) 2,880 mm (9 ft 5 in) (intermediate cars)
Height	3,745 mm (12 ft 3 in)
Doors	4 pairs of sliding doors per side
Maximum speed	95 km/h (60 mph) (24 series; Kintetsu Keihanna Line) 70 km/h (45 mph) (other series)
Traction system	Variable-frequency
Traction motors	Four 140 kW (190 hp) traction motors per motor car
Power output	560 kW (750 hp) per motor car
Acceleration	3.0 km/h/s (21/24 series) 2.5 km/h/s (other series)
Deceleration	3.5 km/h/s (4.5 km/h/s emergency)
Electric system(s)	750 V DC
Current collection method	Third rail contact shoes
Braking system(s)	Electric commanding brake with regenerative brake
Safety system(s)	WS-ATC (21/22/23/24/OTS series) WS-ATC, CS-ATC, ATO (25 series)
Track gauge	1,435 mm (4 ft 8 ^1⁄2 in)

Variants

•      21 series: 10-car sets used on the Midōsuji Line and the Kita-Osaka Kyuko Railway Namboku Line
•      22 series: 6-car sets used on the Tanimachi Line
•      23 series: 6-car sets used on the Yotsubashi Line
•      24 series: 6-car sets used on the Chūō Line and the Kintetsu Keihanna Line
•      25 series: 4-car sets used on the Sennichimae Line
•      OTS series (OTS系): 6-car sets introduced in 1997 on the opening of the Cosmosquare to Osakakō segment of the Chūō Line and owned by Osaka Port Transport System (OTS), transferred to Tanimachi Line in 2006 and rechristened as 22-50 series

• 
  A 21 series set in February 2006
• 
  A 22 series set in April 2006
• 
  A refurbished 23 series set in August 2012
• 
  A 24 series set in May 2009
• 
  A 25 series set in July 2011

Formation

Trains are formed as follows.[1]

21 series

Car No.	1	2	3	4	5	6	7	8	9	10
Designation	Tec2	Ma2	Mb2	T	T'	Ma1'	Tbp	Mb1	Ma1	Tec1
Numbering	219xx	212xx	213xx	215xx	218xx	214xx	217xx	211xx	210xx	216xx

Car 6 is designated as a women-only car (Weekday only).

22/23/24/OTS series

Car No.	1	2	3	4	5	6
Designation	Tec1	Mb1'	T'	Mb2	Ma2	Tec2
Numbering	2600	2100	2800	2300	2200	2900

22 series car 3 is designated as a women-only car (Rush hour only).

25 series

Car No.	1	2	3	4
Designation	Tec1	Mb1'	Mb2	Tec2
Numbering	256xx	251xx	253xx	259xx

References

1. 私鉄車両編成表 2016 [Private Railway Rolling Stock Formations - 2016] (in Japanese). Japan: Kotsu Shimbunsha. 25 July 2016. pp. 154–156. ISBN 978-4-330-70116-5.