Osaka Municipal Subway 20 series
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| Osaka Municipal Subway 20 series | |
|---|---|
 A 20 series trainset on the Kintetsu Keihanna Line in December 2023 | |
| In service | 1984–March 2024 |
| Manufacturer | Hitachi, Kawasaki Heavy Industries, Kinki Sharyo, Tokyu Car Corporation |
| Constructed | 1984–1989 |
| Entered service | 24 December 1984 |
| Number built | 96 vehicles (16 sets)[1] |
| Number in service | None |
| Formation | 6 cars per trainset |
| Fleet numbers | 2601–2607, 2631–2639[2] |
| Operators | Osaka Municipal Transportation Bureau (1984–2018) Osaka Metro (2018–2024) |
| Depots | Dainichi, Midorigi, Morinomiya, Yao |
| Lines served |
|
| Specifications | |
| Car body construction | Aluminium alloy |
| Doors | 4 pairs per side |
| Maximum speed | 95 km/h (59 mph) |
| Traction system | GTO–VVVF (as built)[1] IGBT–VVVF (after refurbishment) |
| Electric system(s) | 750 V DC |
| Current collection | Third rail contact shoes |
| Safety system(s) | WS-ATC |
| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) |
The Osaka Municipal Subway 20 series (大阪市交通局20系) was a rapid transit electric multiple unit (EMU) train type operated by Osaka Municipal Subway (now Osaka Metro) in Japan between 1984 and 2024.
The trains have aluminium bodies.[2] The 20 series was the first Japanese train type powered by a third rail to use variable-frequency drive (VVVF) technology from new, the second overall in Japan (after the Kumamoto City Transportation Bureau 8200 series LRV and only the third such train type in the world (the HKL Class M100 for Helsinki Metro being the first overall). The VVVF technology used on the 20 series was developed jointly by Hitachi, Mitsubishi Electric and Toshiba.[3] They were also the first trains on the Chūō and Tanimachi lines to include air-conditioning from new.[4]
