Class 450 Desiro

The Class 450 is part of the Desiro family of EMU and are very similar to the Class 350 but works on the former Southern Region 750V DC third rail system (the 350s operate off 25kV AC OHLE). One hundred and twenty seven sets have been built for South West Trains replacing life expired "slam door" VEP and CIG stock [1]. Although they can only be used on third-rail electrified routes they do have space for the retro-fitting of a pantograph if needed in the future.

Information
Number built: 508 (127 4-car sets)
Built: 2002-7
Builder: Siemens Transportation
Engine: 4 1TB2016 0GB02 three-phase traction motors (750V DC third rail)
Power: 2, 682 hp (2, 000 kW)
Formation: Driving Motor Standard Open (DMSO)+Trailer Composite Open (TCO)+
Trailer Standard Open (TSO)+Driving Motor Standard Open (DMSO)

The original fleet is known as the Class 450/0 and can carry 242 standard class and 24 first class passengers, first and some standard class seating is 2+2 with other standard class seating being 2+3. Twenty eight sets were modified for higher capacity (facilitated by removing first class seats and altering the internal layout) for the Waterloo-Windsor route [2] in 2008-9 as Class 450/5. First class seating was restored to these units as they were replaced by Class 458/5s on the route from 2013 and the 450/5s rejoined the main fleet.



Originally SWT were to receive a mixed fleet of 450/0s and 450/2s which were to be 5-car sets for inner suburban routes however the idea was dropped due to problems with platform lengths. All 127 sets remain in service with South West Trains and will be retained by First MTR who will take over the franchise in the late Summer of 2017 [3].
450 083 at Reading

450 562 at Portsmouth Harbour

450 093 and 037 at Woking

450 544 at Clapham Junction

450 088 at Guildford


[1] John Balmforth, South West Trains (Ian Allan, 2011) p. 62
[2] Colin J Marsden, DMU and EMU Recognition Guide (Ian Allan, 2013) p. 349
[3] Modern Railways (May 2017) p. 24