British Rail Class 450
The British Rail Class 450 Desiro are third-rail DC electric multiple unit (EMU) passenger trains that entered service during 2003. Used for outer-suburban services, they were built with both first- and standard-class accommodation. They have a maximum speed of 100 mph (160 km/h).
| British Rail Class 450 Desiro | |
|---|---|
A South Western Railway Class 450 at Barnes in 2023 | |
Refurbished standard-class saloon | |
| In service | 5 October 2003 – present |
| Manufacturer | Siemens Transportation Systems |
| Built at | Krefeld, Germany |
| Family name | Desiro |
| Replaced | |
| Constructed | 2002–2006 |
| Refurbished | 2017–2020 |
| Number built | 127 |
| Formation | 4 cars per unit: DMOC-TOSL-TOSLW-DMOC |
| Fleet numbers | 450001–450127 |
| Capacity |
|
| Owners | Angel Trains |
| Operators | South Western Railway |
| Depots | Northam (Southampton) |
| Specifications | |
| Car body construction | Aluminium |
| Train length | 81.60 m (267 ft 9 in) |
| Car length | 20.34 m (66 ft 9 in) |
| Width | 2.796 m (9 ft 2.1 in) |
| Floor height | 1.157 m (3 ft 9.6 in) |
| Doors | Double-leaf sliding plug (2 per side per car) |
| Wheel diameter | 850–786 mm (33.46–30.94 in) (new–worn) |
| Wheelbase | Bogies: 2.600 m (8 ft 6.4 in) |
| Maximum speed | 100 mph (160 km/h) |
| Weight |
|
| Traction system | Siemens SIBAS IGBT |
| Traction motors | 8 × Siemens 1TB2016-0GB02 asynchronous three-phase AC |
| Power output | 1,500 kW (2,000 hp) (at wheel) |
| Tractive effort | Starting: 200 kN (45,000 lbf) |
| Acceleration | approx. 1 m/s2 (3.3 ft/s2) |
| Electric system(s) | 750 V DC third rail |
| Current collector(s) | Contact shoe |
| UIC classification | Bo′Bo′+2′2′+2′2′+Bo′Bo′ |
| Bogies | Siemens SGP SF5000 |
| Minimum turning radius | 120 m (393 ft 8 in) |
| Braking system(s) | Electro-pneumatic (disc) and regenerative |
| Safety system(s) |
|
| Coupling system | Dellner 12 |
| Multiple working | Within class, and with Class 444 |
| Track gauge | 1,435 mm (4 ft 8+1⁄2 in) standard gauge |
The Desiro UK family also includes units of Classes 185, 350, 360, 380 and 444.
Along with the Class 444 Desiro, the Class 450 units are operated by South Western franchise operator South Western Railway.
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