British Rail Class 450

British Rail Class 450 Desiro
A South Western Railway Class 450 at Barnes in 2023
Refurbished standard-class saloon
In service5 October 2003 – present
ManufacturerSiemens Transportation Systems
Built atKrefeld, Germany
Family nameDesiro
Replaced
Constructed2002–2006[1]
Refurbished2017–2020[2]
Number built127[3]
Formation4 cars per unit:
DMOC-TOSL-TOSLW-DMOC[4]
Fleet numbers450001–450127
Capacity
  • As built: 264 seats
    (24 first-class, 240 standard)[5]
  • As refurbished: 285 seats
    (16 first-class, 269 standard)[4]
OwnersAngel Trains[3]
OperatorsSouth Western Railway
DepotsNortham (Southampton)[1]
Specifications
Car body constructionAluminium
Train length81.60 m (267 ft 9 in)[6]
Car length20.34 m (66 ft 9 in)[3]
Width2.796 m (9 ft 2.1 in)[6]
Floor height1.157 m (3 ft 9.6 in)[6]
DoorsDouble-leaf sliding plug
(2 per side per car)
Wheel diameter850–786 mm (33.46–30.94 in) (new–worn)[6]
WheelbaseBogies: 2.600 m (8 ft 6.4 in)[7]
Maximum speed100 mph (160 km/h)[1]
Weight
  • 175.71 tonnes (172.93 long tons; 193.69 short tons)[5]
Traction systemSiemens SIBAS IGBT[6]
Traction motors8 × Siemens 1TB2016-0GB02
asynchronous three-phase AC[3]
Power output1,500 kW (2,000 hp) (at wheel)[6]
Tractive effortStarting: 200 kN (45,000 lbf)[5]
Accelerationapprox. 1 m/s2 (3.3 ft/s2)[6]
Electric system(s)750 V DC third rail
Current collector(s)Contact shoe
UIC classificationBo′Bo′+2′2′+2′2′+Bo′Bo′[6]
BogiesSiemens SGP SF5000[6]
Minimum turning radius120 m (393 ft 8 in)[7]
Braking system(s)Electro-pneumatic (disc) and regenerative
Safety system(s)
Coupling systemDellner 12[8]
Multiple workingWithin class, and with Class 444[4]
Track gauge1,435 mm (4 ft 8+12 in) standard gauge

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).

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.

  1. ^ a b c Trains - Reference List (PDF). Erlangen: Siemens Transportation Systems. 8 September 2006. p. 39. Archived from the original (PDF) on 6 October 2011. Retrieved 30 December 2021.
  2. ^ "SWR completes £70m 'Desiro' refurbishment as final train enters service". Aberdeen: FirstGroup plc. 10 January 2020. Retrieved 13 January 2023.
  3. ^ a b c d "Our Fleet - Class 450". London: Angel Trains. Archived from the original on 4 September 2021. Retrieved 29 December 2021.
  4. ^ a b c "Our Trains - Class 450 'Desiro'". South Western Railway. London: First MTR South Western Trains. Archived from the original on 19 January 2022. Retrieved 13 January 2022.
  5. ^ a b c Technical Information: Class 450 (PDF). London: Siemens Transportation Systems. 2003. Archived from the original (PDF) on 7 November 2007. Retrieved 11 January 2023.
  6. ^ a b c d e f g h i Technical Information: Desiro UK Electrical Multiple Unit Family. Erlangen: Siemens Transportation Systems. 2005. Order No. A19100-V800-B251-V2-7600.
  7. ^ a b First Class Bogies (PDF) (08/08 ed.). Graz: Siemens Transportation Systems. pp. 60–61, 67. Archived from the original (PDF) on 27 June 2013. Retrieved 11 January 2023.
  8. ^ System Data for Mechanical and Electrical Coupling of Rail Vehicles in support of GM/RT2190 (PDF). London: Rail Safety and Standards Board. 22 June 2011. p. 4. SD001. Archived from the original (PDF) on 1 April 2012. Retrieved 22 November 2022.