British Rail Class 720

British Rail Class 720 Aventra
A Greater Anglia Class 720/5 on test at Wolverton in September 2020
Interior of a Greater Anglia unit
In service	Greater Anglia: 26 November 2020 c2c: 2022 (planned)
Manufacturer	Bombardier Transportation
Built at	Derby Litchurch Lane Works
Family name	Aventra
Replaced	Class 317 Class 321 Class 322 Class 360 Class 379 Class 387
Constructed	2018 – present
Number under construction	Greater Anglia: 133 units c2c: 12 units
Formation	Greater Anglia: 133 x 5 cars c2c: 12 x 5 cars
Capacity	5-car: 540 seats, 145 standing 10-car: 1,100 seats, 290 standing[1][2]
Operator(s)	c2c(future) Greater Anglia
Specifications
Train length	5 cars - 122 m (400 ft 3 in) 10 cars - 243 m (797 ft 3 in)
Doors	Plug
Maximum speed	100 mph (161 km/h)
Electric system(s)	25 kV AC (OHLE)
Current collection method	Pantograph
Bogies	Flexx-Eco[3]
Coupling system	Dellner
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

The British Rail Class 720 Aventra is a class of electric multiple unit (EMU) designed and produced by the rolling stock manufacturer Bombardier Transportation. Orders for the type have been placed by both Greater Anglia and c2c.

As of May 2021, 145 Class 720 units have been ordered in five car and ten car configurations; these are to be operated across multiple suburban lines leading out of both London Liverpool Street (Greater Anglia and c2c) and London Fenchurch Street (c2c).^[4] Originally intended to be introduced during 2019, delays were encountered during development that minorly impacted this timetable. On 26 November 2020, Greater Anglia commenced the Class 720's introduction, its initial operations were centered on the London Liverpool Street to Southend Line;^[4] all units were intended to be in service by the summer of 2020.^[5] c2c's fleet has been anticipated to enter service sometime during 2022.^[6]

Cab interior of a class 720

Description[]

The Class 720 is a member of the rolling stock manufacturer Bombardier's Aventra family of multiple units, having been developed from the company's successful line of Electrostar electric multiple units (EMUs).^[5] In comparison to the preceding Electrostar, with which it shares numerous elements, the Class 720 is a considerably lighter vehicle, and features longer carriages: a 10-car Class 720 train is approximately the same length as a 12-car Class 360 train, the 10-car Class 720 has a tare weight of 386 tonnes in contrast to the 516 tonnes of the 12-car Class 360 train, while providing considerably more seating.^[5]

Each car has a length of 24 metres, the bodyshell of which is composed of aluminium, the assembly of which using both welding and bolting techniques.^[5] The Class 720 has a maximum speed of 100mph (161km/h), possessing a starting tractive effort per motor of 21.6kN and a peak traction power at the wheel of 2,300kW per unit to achieve its maximum rate of acceleration of 0.8m/s². The driver is seated in a central position within the forward cab; a second seat is provided for an observer/instructor.^[5]

The Class 720 has been produced on both five car and ten car configurations. The five car units have a length of 122 m and accommodate up to 540 seated passengers in a standard class seating configuration; in contrast, the ten car units have a length of 234 m and provide 1,100 standard class seats. As of January 2018, no operator has chosen to configure their Class 720 fleets with first class accommodation.^[2][7]

The interior of Class 720 features a 3+2 seating arrangement, these seats are intentionally cantilevered above the floor to provide greater under-seat space for storing personal luggage as well as to ease cleaning.^[8] Furthermore, various amenities are present for the convenience and comfort of the travelling public; each car benefits from air conditioning throughout, while numerous passenger information systems, displaying passenger-loading indicators amongst other information, are present across each carriage's interior.^[4] Every seat is provided with its own seat-back table and power sockets, while on-train WiFi enables online connectivity throughout the journey. Onboard toilet facilities are also present.^[4] Akin to trains operated by the London Overground, the Class 720s have through gangways to encourage passengers to spread out across the train.^[4] The interior is also fully compliant with the Technical Specification for Interoperability for Persons of Reduced Mobility, featuring dedicated spaces for wheelchairs, as well as spaces for bicycles; one of the two toilets present in a five-car formation is also outfitted for greater accessibility.^[5]

In September 2017, Greater Anglia unveiled an early mockup of the interior intended to be fitted to the Class 720 fleet; this was used as part of a consultation that solicited 1,000 responses from members of the public; numerous changes were subsequently made to the interior. Alterations included the replacement of the originally intended Fainsa seating with softer seating supplied by Kiel, as well as the addition of seat back tables.^[4] The units also featured underfloor heating, eliminating the need for the bodyside heaters and thus increasing floorspace for more passengers;^[5] this heating arrangement was allegedly the first use amongst any train on the British railway system.^{[citation needed]}

History[]

Greater Anglia[]

In August 2016, Greater Anglia was awarded the East Anglia franchise with a commitment to replace all of the existing fleet. As part of this, an order was placed with Bombardier for 111 electric multiple units that were members of the recently-launched Aventra family.^[9][10] These new trains were designated as the Class 720 and were originally planned to be divided into two sub-classes; 89 five-carriage 720/5 units and 22 ten-carriage 720/1 units.^[11] However, during October 2020, Greater Anglia amended its order to increase the quantity of the Class 720/5s to 133 and increasing flexibility by cancelling all orders of 720/1s, which will give the same amount of carriages, a total of 665.^[12][5]

The Class 720 is a replacement for a diverse range of units, including the Class 317 and Class 321 units, together with the more modern Class 360 and Class 379 fleets that has been long used on Outer suburban services on the West Anglia and Great Eastern Main Lines.^[11] The Class 720s are constructed at Bombardier's Derby Litchurch Lane Works.^[13] The order has been financed by the rolling stock company Angel Trains.^[14][15] The introduction of the fleet has been accompanied by a roughly £300 million investment in new and refurbished infrastructure, affecting depots, sidings, and stations, to best accommodate the new trains.^[5]

c2c[]

During December 2017, c2c announced it had reached an agreement with Bombardier to procure 60 vehicles of the latter's Aventra family, formed into six 10-car trains, that were anticipated to enter service in approximately 2021.^[6] They will be classified as the Class 720/6, having originally been designated as the Class 711.^[16][17] The new Aventra trains will replace the six four-car Class 387s that have been operated alongside the Class 357s.^[18] These units have been financed by Porterbrook.^[19]

Operation[]

Greater Anglia[]

Production of the first unit for Greater Anglia began in February 2018 and was completed in September 2018.^[20][21] Early on, it had been intended for the type to enter service during 2019, but the fleet's introduction had to postponed into the following year due to software issues pertaining to the onboard Train Control Management System (TCMS).^[5][22] Testing of the first unit commenced on 17 March 2020, this work initially took place on the London Liverpool Street to Southend Line.^[23] Both the testing and production programmes were impacted by the COVID-19 pandemic that took hold during 2020. On 8 June 2020, operational use of the Class 720 was formally authorised by the Office of Rail and Road (ORR).^[5]

On 26 November 2020, the first two units started passenger service on the London Liverpool Street to Southend Line,^[24] on 16 December 2020, they started service on the Braintree branch,^[25] and on 23 December 2020, the Class 720s were rolled out on Southminster services.^[26] In February 2021, it was reported that driver training had begun for their introduction to the Cambridge route.^[27] That same month, Ian McConnell, Greater Anglia’s franchise and programmes director, noted that the Class 720 was already running relatively well and free of any meaningful technical issues, with challenges with the onboard software issues being the chief concern with the type's deployment at that point.^[5] According to railway industry periodical Rail Engineer, Greater Anglia intend to gradually extend the new fleet's usage to eventually cover all of the Great Eastern routes in Essex and through to Ipswich during the first half of 2021, while the Class 720 would be introduced to the west Anglia route between Liverpool Street and Cambridge in the second half of the year.^[5] On 23 March 2021, the 720's was introduced on the Liverpool street to Clacton, Colchester town and Ipswich services.^[28] On the 25th August 2021 The class 720's was entered service on the West Anglia mainline.^[29]

Fleet details[]

The units resemble that of the Class 345 and Class 710 built for Crossrail and London Overground respectively. However, owing to the services that they will operate, the 720s will be built with a higher top speed of 100 mph (161 km/h), and will be fitted with a more appropriate interior.

Class	Operator	No. Built	Year Built	Cars per Set	Unit Nos.
Class 720/5	Greater Anglia	44	TBC	5[30]	720101–720144[31]
		89	2018-		720501–720589
Class 720/6	c2c	12	TBC		720601–720612[32]

References[]

External links[]

• 360° interior visualisation

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