Osaka Municipal Subway New 20 series
A line-up of the five different 20 series variants at Midorigi Depot in November 2016
In service	1990–present
Manufacturer	Alna Kōki, Hitachi Rail Japan, Kawasaki Heavy Industries, Kinki Sharyo, Nippon Sharyo, Tokyu Car Corporation
Replaced	30 series
Constructed	1990–1998
Entered service	25 April 1990
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)
Operators	Osaka Municipal Transportation Bureau (1990–2018) Osaka Metro (2018–present)
Depots	Nakamozu (21 series) Dainichi (22 series) Midorigi (23 series) Morinomiya (24/25/OTS series)
Lines 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	187.4 m (614 ft 10 in) (21 series) 112.6 m (369 ft 5 in) (22/23/24/OTS series) 75.2 m (246 ft 9 in) (25 series)
Car length	18.9 m (62 ft 0 in) (end cars) 18.7 m (61 ft 4 in) (intermediate cars)
Width	2.89 m (9 ft 6 in) (end cars) 2.88 m (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 (59 mph) (24 series; Kintetsu Keihanna Line) 70 km/h (43.5 mph) (other series)
Traction system	Variable-frequency
Traction motors	Four 140 kW (188 hp) traction motors per motor car
Power output	560 kW (751 hp) per motor car
Acceleration	3 km/(h⋅s) (1.9 mph/s) (21/24 series) 2.5 km/(h⋅s) (1.6 mph/s) (other series)
Deceleration	3.5 km/(h⋅s) (2.2 mph/s) 4.5 km/(h⋅s) (2.8 mph/s) (emergency)
Electric system(s)	750 V DC
Current collector(s)	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) TASC (21 series)
Track gauge	1,435 mm (4 ft 8+1⁄2 in)

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.

Variants

The New 20 series was developed from the earlier 20 series (ja:大阪市交通局20系電車) trains introducted on the Chūō Line from 1984.

•   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 reclassified 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 refurbished 24 series set in April 2017
• 
  A refurbished 25 series set in February 2014
• 
  An OTS series set in July 2002
• 
  21 series rooftop AC condenser unit

Formation

Trains are formed as follows.^[1]

References