|Number built:||225 cars (45 5-car sets)|
|Engine:||1TB2016-0GB02 traction motors (750v DC third rail)|
|Power:||2, 682 hp (2, 000 kW)|
|Formation:||Driving Motor Standard Open (DMSO)+Trailer Standard
Open (TSO)+TSO+Trailer Standard Buffet (TSRMB)+
Driving Motor Composite Open (DMCO)
The Class 444 differs from the 450 in being a 5-car set and with a low-density seating arrangement  to better suit longer journeys. Like the 450 the 444s are equipped with a pantograph well and could be converted in future to 25kV AC overhead line electric collection though there are no plans for any such conversion.
Like most new types the 444s had a few teething problems when entering service but quickly became very reliable units and indeed received the Golden Spanner award for being Britain's most reliable trains in 2010 . They are now operated by SWT's successor South Western Railway.
|SWT 444 003 at Clapham Junction|
|SWT 444 013 at Guildford|
|SWR 444 003 at Godalming|
|SWT 444 044 at Portsmouth Harbour|
|SWT 444 022 at Woking|
|SWR 444 005 at Milford|
 John Balmforth, South West Trains (Ian Allan, 2011) p. 66
 Siemens Desiro Class 444 wins award as most reliable train <http://www.transportweekly.com/pages/en/news/articles/78314/>