British Rail Class 717

British Rail Class 717
*Desiro City*
British Rail Class 717; Desiro City
	Great Northern Class 717 unit at Palmers Green
	The standard-class interior of a Class 717 unit
In service	28 September 2018 – present
Manufacturer	Siemens Mobility
Built at	Krefeld, Germany
Family name	Desiro City
Replaced	Class 313
Constructed	2018
Number built	25
Formation	6 cars per unit:; DMOS-TOS-TOS(L)W-MOS-PTOS-DMOS;
Fleet numbers	717001–717025
Capacity	362 seats
Owners	Rock Rail
Operators	Great Northern
Depots	Hornsey (London)
Lines served	East Coast Main Line; Hertford Loop Line; Northern City Line;
Specifications
Car body construction	Aluminium
Train length	121.7 m (399 ft 3 in)
Car length	20.2 m (66 ft)
Width	2.80 m (9 ft 2 in)
Floor height	1.10 m (3 ft 7 in)
Doors	Double-leaf pocket sliding, each 1,500 mm (59 in) wide (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	85 mph (137 km/h)
Weight	204 t (201 LT; 225 ST)
Axle load	Motor bogies: 15.5 t (15.3 LT; 17.1 ST); Trailer bogies: 14.5 t (14.3 LT; 16.0 ST);
Traction system	Siemens IGBT
Power output	1,200 kW (1,600 hp) at wheels
Acceleration	0.85 m/s2 (1.9 mph/s)
Electric system(s)	25 kV 50 Hz AC overhead; 750 V DC third rail;
Current collector(s)	Pantograph (AC); Contact shoe (DC);
UIC classification	Bo′Bo′+2′2′+2′2′+Bo′Bo′+2′2′+Bo′Bo′;
Bogies	Siemens SGP SF7000
Minimum turning radius	120 m (390 ft)
Braking system(s)	Electro-pneumatic (disc) and regenerative
Safety system(s)	AWS; ETCS; TPWS; Tripcock;
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 717 Desiro City is an electric multiple unit passenger train built by Siemens Mobility, currently operated by Govia Thameslink Railway on its Great Northern Hertford Loop and Welwyn stopping routes. Built to replace Class 313 trains on services into Moorgate, a total of 25 six-car units began entering regular service from March 2019. The units are stylistically similar to the Class 700s (in use with Thameslink) and the Class 707s (in use with Southeastern and South Western Railway.)

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