British Rail Class 700

British Rail Class 700
*Desiro City*
British Rail Class 700; Desiro City
	A Thameslink Class 700 at Bedford
	The standard-class interior of a Class 700 unit
In service	20 June 2016 – present
Manufacturer	Siemens Mobility
Built at	Krefeld, Germany
Family name	Desiro City
Replaced	Class 319 (Thameslink); Class 365 (Great Northern); Class 377 (Thameslink); Class 387 (Thameslink); Class 465 (Southeastern); Class 466 (Southeastern);
Constructed	2014–2018
Number built	115
Formation	8 cars per 700/0 unit; 12 cars per 700/1 unit; (See § Fleet and formation details);
Fleet numbers	700/0: 700001–700060; 700/1: 700101–700155;
Capacity	700/0: 427 seats (52F, 373S) plus 719 standees; 700/1: 666 seats (52F, 614S) plus 1088 standees;
Owners	Cross London Trains
Operators	Thameslink
Depots	Hornsey (London); Three Bridges (West Sussex);
Specifications
Car body construction	Aluminium
Train length	700/0: 162.0 m (531 ft 6 in); 700/1: 242.6 m (795 ft 11 in);
Car length	20.2 m (66 ft 3 in)
Width	2.80 m (9 ft 2 in)
Floor height	1.10 m (43.31 in)
Doors	Double-leaf pocket sliding; (2 per side per car);
Wheel diameter	820–760 mm (32.28–29.92 in) (new–worn)
Wheelbase	Motor bogies: 2,200 mm (87 in); Trailer bogies: 2,100 mm (83 in);
Maximum speed	100 mph (160 km/h)
Weight	700/0 total: 278 t (274 long tons; 306 short tons); 700/1 total: 410 t (400 long tons; 450 short tons);
Axle load	Motor bogies: 15.5 t (15.3 long tons; 17.1 short tons); Trailer bogies: 14.5 t (14.3 long tons; 16.0 short tons);
Traction system	Siemens IGBT
Power output	700/0: 3,300 kW (4,400 hp); 700/1: 5,000 kW (6,700 hp);
Electric system(s)	25 kV 50 Hz AC overhead; 750 V DC third rail;
Current collector(s)	Pantograph (AC); Contact shoe (DC);
UIC classification	(See § Fleet and formation details)
Bogies	Siemens SGP SF7000
Minimum turning radius	120 m (390 ft)
Braking system(s)	Electro-pneumatic (disc) and regenerative
Safety system(s)	AWS; ATO; ETCS; TPWS;
Coupling system	Dellner
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge
Notes/references
	Sourced from unless otherwise noted.

The British Rail Class 700 is an electric multiple unit passenger train from the Desiro City family built by Siemens Mobility. It is capable of operating on 25 kV 50 Hz AC from overhead wires or 750 V DC from third rail. 115 trainsets were built between 2014 and 2018, for use on the Thameslink network, as part of the Thameslink Programme in the United Kingdom. As of 2021, they are operated by Govia Thameslink Railway.

In 2011, the consortium Cross London Trains (XLT) consisting of Siemens Project Ventures, 3i Infrastructure, and Innisfree was announced as preferred bidder with Siemens Mobility to manufacture the trains. The decision was politically controversial as the trains were to be built in Germany, while the competing consortium led by Bombardier Transportation had a UK train factory. Both the procurement process and final close of contract were significantly delayed, resulting in the expected first delivery date moving from 2012 to 2016. The £1.6 billion contract to manufacture and provide service depots for the trains was finalised in June 2013. The first train was delivered in late July 2015.

A fleet of 60 eight-car and 55 twelve-car trains entered service between Spring 2016 and 2019. Having replaced Class 319s, 377s, and 387s, Class 700s are the only trains operated on the Thameslink network. Each train is able to reach 100 mph (160 km/h) and carry 1,146 passengers in an 8-car train, and 1,754 passengers in a 12-car train. Maintenance depots have been built at Hornsey and Three Bridges.

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