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| 321 series | |
|---|---|
 321 series set D11 in February 2021 | |
| In service | 2005–present |
| Manufacturer | Kinki Sharyo |
| Built at | Higashiōsaka |
| Replaced | 201 series, 205 series, 207 series (set Z16) |
| Constructed | 2005–2007 |
| Entered service | 1 December 2005 |
| Number built | 273 vehicles (39 sets) |
| Formation | 7 cars per trainset |
| Fleet numbers | D1–D39 |
| Operators | JR-West |
| Depots | Aboshi |
| Lines served | |
| Specifications | |
| Car body construction | Stainless steel |
| Train length | 136.600 m (448 ft 2.0 in) |
| Car length | 19.55 m (64 ft 2 in) (end cars)[1] 19.5 m (64 ft 0 in) (intermediate cars) |
| Width | 2,950 mm (9 ft 8 in)[1] |
| Height | 3,630 mm (11 ft 11 in)[1] |
| Doors | 4 pairs per side |
| Maximum speed | 120 km/h (75 mph) |
| Weight | 232.8 t (513,236 lb)[1] |
| Traction system | Variable frequency (2-level IGBT)[1] |
| Power output | 270 kW (362 hp) |
| Acceleration | 2.5 km/(h⋅s) (1.55 mph/s) |
| Deceleration | 4.2 km/(h⋅s) (2.61 mph/s) (emergency) |
| Electric system(s) | 1,500 V DC overhead[1] |
| Current collector(s) | WPS27D scissors-type pantograph |
| Bogies | WDT63 (powered), WTR246/WTR246A (trailer) |
| Braking system(s) | Regenerative brake, electronically controlled pneumatic brakes, snow-resistant brake |
| Safety system(s) | ATS-SW, ATS-P |
| Track gauge | 1,067 mm (3 ft 6 in) |
The 321 series (321系, 321-kei) is a DC electric multiple unit (EMU) commuter train type operated by West Japan Railway Company (JR-West) in the Kansai Region of Japan.