British Rail Class 701

British Rail Class 701
*Aventra*
British Rail Class 701; Aventra
	Class 701 at Egham during testing
	Interior of a Class 701
In service	9 January 2024 - present
Manufacturer	Bombardier Transportation; Alstom;
Built at	Derby Litchurch Lane Works
Family name	Aventra
Replaced	Class 455; Class 707;
Constructed	2019–2024
Number built	90
Formation	10 cars per 701/0 unit; 5 cars per 701/5 unit; (See § Fleet details)
Fleet numbers	701/0: 701001–701060; 701/5: 701501–701530;
Capacity	701/0: 556 seats; plus 746 standees; 701/5: 274 seats; plus 361 standees;
Operators	South Western Railway
Depots	Feltham; Wimbledon;
Lines served	Current: Waterloo to Windsor; Future: Reading; Windsor; South West London suburban;
Specifications
Doors	Double-leaf sliding plug (2 per side per car)
Maximum speed	100 mph (160 km/h)
Traction system	Bombardier IGBT Inverter
Traction motors	701/0: 16x 250kW (335hp); 701/5: 8x 250kW (335hp);
Power output	701/0: 4000kW (5364hp); 701/5: 2000kW (2682hp);
Acceleration	Maximum Current: ; Starting: 0.96 m/s2 (3.1 ft/s2) ; Reduced Current: ; Starting: 0.7 m/s2 (2.3 ft/s2)
Deceleration	0.9 m/s2 (3.0 ft/s2)
Electric system(s)	750 V DC third rail
Current collector(s)	Contact shoe
Bogies	Flexx B5000
Braking system(s)	Electro-pneumatic (disc) and rheostatic/regenerative
Safety system(s)	AWS; TPWS; ETCS; ABDO; ASDO;
Coupling system	Dellner
Multiple working	Within subclass /5 only
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The British Rail Class 701 Aventra is a class of electric multiple unit passenger train built by Bombardier Transportation (now Alstom) at Derby Litchurch Lane Works. Built on the Aventra platform, they are branded as Arterio trains by SWR, and operate some services between Waterloo and Windsor. In the future the trains are planned to operate services on the Reading, Windsor and South West London suburban lines.

Ordered in 2017, the trains were originally due to enter service from mid-2019, but were subject to several delays which prevented this. By December 2023, 50 units had been accepted by SWR.

SWR began their phased entry into service from January 2024. They will eventually allow the withdrawal of SWR's fleets of Class 455 units and the cascade of the Class 458 fleet to longer-distance services.

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