|Number built:||508 (127 4-car sets)|
|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  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 .
|450 083 at Reading|
|450 562 at Portsmouth Harbour|
|450 093 and 037 at Woking|
|450 544 at Clapham Junction|
|450 088 at Guildford|
 John Balmforth, South West Trains (Ian Allan, 2011) p. 62
 Colin J Marsden, DMU and EMU Recognition Guide (Ian Allan, 2013) p. 349
 Modern Railways (May 2017) p. 24