Class 707 Desiro City

Part of the Desiro City family like the Class 700, the Class 707 were built for services out of London Waterloo along the Windsor and Reading corridors [1].

Information
Number built: 150 (30 5-car sets)
Built: 2015-17
Builder: Siemens Transportation
Engine: Siemens Traction System (750v DC third rail)
Power: 1, 600 hp (1, 200 kW)
Formation: Driving Motor Standard Open (DMSO)+Trailer Standard Open (TSO)
+TSO+TSO+DMSO

The fleet was ordered by South West Trains to increase capacity especially in peak-hour serices out of Waterloo. The first 707s were delivered at the end of 2016 with an entry into service in the late Summer of 2017. Then events overtook them. SWT's franchise was taken over by South Western Railway who saw the 707s as being unsuitable for their planned servie improvements and ordered Aventra family EMUs instead [2]. The Class 707s will be replaced from 2019.

As yet the future of the 707s is undecided. In theory they could be scrapped though this is unlikely of course and they will be found somewhere else to operate. They were built as dual voltage EMUs though only a couple have been fitted with pantographs for testing on 25kV AC overhead lines, the rest only have DC third rail shoes fitted.
SWR 707 002 at Clapham Junction

SWR 707 014 arrives at Clapham Junction

Another SWR 707 at Clapham Junction

[1] Colin J. Marsden, Rail Guide 2016 (Ian Allan, 2016) p. 123
[2] "South Western Railway: the masterplan and its challenges", Modern Railway (January 2018) p. 51