The Alexander Dennis Enviro400 is a twin-axle

low-floor Accessibility is the design of products, devices, services, vehicles, or environments so as to be usable by people with disabilities. The concept of accessible design and practice of accessible development ensures both "direct access" (i. ...

double-decker bus A double-decker bus or double-deck bus is a bus that has two storeys or decks. They are used for mass transport in the United Kingdom, the United States, New Zealand, Europe, Asia and also in cities such as Sydney; the best-known example is the ...

that was built by the

British British may refer to: Peoples, culture, and language * British people, nationals or natives of the United Kingdom, British Overseas Territories, and Crown Dependencies. ** Britishness, the British identity and common culture * British English, ...

bus manufacturer

Alexander Dennis Alexander Dennis is a British bus manufacturing company based in Larbert, Scotland. The largest bus and coach manufacturer in the United Kingdom with a 50% market share in 2019, it has manufacturing plants and partnerships in Canada, China, E ...

between 2005 and 2018. It replaced the

Alexander ALX400 The Alexander ALX400 (later known as the TransBus ALX400 and the Alexander Dennis ALX400) was a 2-axle double-decker bus body built by Walter Alexander Coachbuilders (later by TransBus International/Alexander Dennis). It was one of the ALX-seri ...

, Dennis Trident (from which the Enviro400 was developed) and

Plaxton President The Plaxton President was a low floor double-decker bus body built at Northern Counties plant in Wigan, England and branded as a Plaxton product for its main production run. It was first unveiled in 1997 on the longitudinal Volvo B7L chas ...

. In 2014, the Enviro400 was succeeded by the updated

Alexander Dennis Enviro400 MMC The Alexander Dennis Enviro400 MMC (sold as the Alexander Dennis Enviro400) is a low-floor bus, low-floor double-decker bus produced by the British bus manufacturer Alexander Dennis since 2014, replacing the Alexander Dennis Enviro400. The Envi ...

and production of the classic Enviro400 ceased in 2018. The Enviro400 is available both as an integral bus and as a standalone bodywork and chassis. The Enviro400 chassis replaced the

Dennis Trident 2 The Dennis Trident 2 is a 2-axle low-floor double-decker bus chassis originally manufactured by Dennis, which was unveiled in 1997 and replaced the Dennis Arrow. It was built by TransBus after Dennis was incorporated into the group in 2001, t ...

(and continued to be badged as the Trident for a time) and was formerly available with East Lancs Myllennium Lolyne and Optare Olympus bodywork; the Enviro400 body replaced the Alexander ALX400 and Plaxton President designs and was sold on Scania N230UD,

Volvo B7TL The Volvo B7TL is a low-floor double-decker bus chassis which was launched in 1999 and replaced the 2-axle version of the Volvo Olympian (its 3-axle version was replaced by the Volvo Super Olympian). It was built as the British bus operators ...

and

Volvo B9TL The Volvo B9TL is a low-floor double-decker bus built by Volvo from 2002 until 2018. It superseded the Volvo Super Olympian and the Volvo B7TL. The 2-axle version has been superseded by the Volvo B5TL in 2014 and the 3-axle version has been su ...

chassis.

First generation (2005–2010)

The Enviro400 was originally launched as an integral product. Soon after launch, the Enviro400 chassis became available with East Lancs Myllennium Lolyne and Optare Olympus bodywork. As well as an integral bus, the Enviro400 body was available on

Scania N-series The Scania N series is a line of low-floor bus chassis with straight-up, transversely mounted Euro IV or newer engine at the rear, built by Scania since 2006, replacing the Scania N94. It is available as the N UB (N230UB, N270UB, N280UB) two-ax ...

chassis. The vast majority of N-series Enviro400s built were of the N230UD variant, which sold well with

Stagecoach Group Stagecoach Group is a transport group based in Perth, Scotland. It operates buses, express coaches and a tram service in the United Kingdom. History Stagecoach was born out of deregulation of the British express coach market in the early ...

. Additionally, two N-series Enviro400s were built on the more powerful N280UD variant of the chassis, both for Express Motors of Porthmadog. As well as the

, a single Enviro400 was constructed on

chassis before this chassis was succeeded by the

, on which more examples of the Enviro400 were bodied.

Second generation (2008–2018)

First Manchester 33736 SN12ANP (8685877847)

Alexander Dennis released the second generation Enviro400 at Euro Bus Expo in 2008, with the main external visual differences being the incorporation of a line of white LED

daytime running light A daytime running lamp (DRL, also daytime running light) is an automotive lighting and bicycle lighting device on the front of a roadgoing motor vehicle or bicycle, automatically switched on when the vehicle's handbrake has been pulled down, wh ...

s underneath the headlights in the main front light clusters, redesigned front bumpers and the relocation of the offside emergency exit door. The facelift coincided with the introduction of a Euro 5 compliant drivetrain for the Enviro400. The ''Trident'' moniker on the chassis plates was largely dropped not long afterwards, but the ''Trident 2'' name was retained on Enviro400s built for Hong Kong. The second generation Enviro400 was superseded by the Enviro400 MMC in 2015 in the UK with no more orders, but in 2016 Alexander Dennis developed a low-height Enviro400 with Enviro400 MMC-style front and rear specifically for Hong Kong market. Production of Enviro400 ceased in 2018.

Powertrain variants

Integral Enviro400

London London is the capital and List of urban areas in the United Kingdom, largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary dow ...

operator

Metroline Metroline is a bus company operating services in Greater London and south Hertfordshire. It is a subsidiary of ComfortDelGro Corporation and operates services under contract to Transport for London. As at March 2021, the fleet consisted of 1,5 ...

was the first company to order the Enviro400, ordering 28 for route 24 in June 2005, entering service at the end of the year. One dual door demonstrator, named ''

Spirit of London 19000 ''Spirit of London'' is an Alexander Dennis Enviro400 double-decker bus which entered service in London in October 2005. Originally carrying fleet number 18500, ''Spirit of London'' was built as the replacement for the bus destroyed i ...

'', was delivered to

Stagecoach London Stagecoach London is a major bus operator in Greater London. It is a subsidiary of Stagecoach and operates services under contract to Transport for London mostly in East and South East London as well as some services into Central London. It i ...

to replace the Dennis Trident destroyed during the

7 July 2005 London bombings The 7 July 2005 London bombings, often referred to as 7/7, were a series of four coordinated suicide attacks carried out by Islamic terrorists in London that targeted commuters travelling on the city's public transport system during the mo ...

and a single door demonstrator was delivered to the then

Travel West Midlands National Express West Midlands (NXWM) is a bus operator in the West Midlands that operates services in Birmingham, Dudley, Sandwell, Walsall, Wolverhampton, and Solihull, as well as limited routes outside of the general area of Birmingham, s ...

for evaluation. Both prototypes were exhibited at Coach & Bus Live 2005 in the National Exhibition Centre in

Birmingham Birmingham ( ) is a city and metropolitan borough in the metropolitan county of West Midlands in England. It is the second-largest city in the United Kingdom with a population of 1.145 million in the city proper, 2.92 million in the We ...

. The Enviro400 had sold well in

with a number of operators, such as

Travel London Travel London was a bus company operating services in Greater London. It was a subsidiary of National Express before being sold in May 2009 to NedRailways. In October 2009, it was rebranded as Abellio London.

and

London General London General is a bus company operating in Greater London. It is a subsidiary of the Go-Ahead Group and operates services under contract to Transport for London. The company is named after the London General Omnibus Company, the principal ...

(which received the first Euro IV-engined Enviro400 in May 2006), operating these buses. It is also popular with

Stagecoach A stagecoach is a four-wheeled public transport coach used to carry paying passengers and light packages on journeys long enough to need a change of horses. It is strongly sprung and generally drawn by four horses although some versions are dra ...

, which placed its first order of 130 low-height models in February 2006, later followed by another 389 buses with Euro IV/V engine.

Arriva Arriva plc is a British multinational public transport company headquartered in Sunderland, England.Arriva Merseyside relaunched its Wirral - Liverpool 'Cross River' services with a batch of 23 in January 2009. A further batch of 12 was allocated to

Bootle Bootle (pronounced ) is a town in the Metropolitan Borough of Sefton, Merseyside, England, which had a population of 51,394 in 2011; the wider Parliamentary constituency had a population of 98,449. Historically part of Lancashire, Bootle's ...

depot in September 2009 originally for the cross-Liverpool trunk service 60 linking Bootle with Aigburth. However a much larger order of 128 Enviro400s was placed by Arriva for its Merseyside division from the autumn of 2014 onwards with significant numbers in service at Bootle, Green Lane, St Helens,

Southport Southport is a seaside town in the Metropolitan Borough of Sefton in Merseyside, England. At the 2001 census, it had a population of 90,336, making it the eleventh most populous settlement in North West England. Southport lies on the Iris ...

and

Speke Speke () is a suburb of Liverpool. It is southeast of the city centre. Located near the widest part of the River Mersey, it is bordered by the suburbs of Garston and Hunts Cross, and nearby to Halewood, Hale Village, and Widnes. The rural ...

depots. The

FirstGroup FirstGroup plc is a British multi-national transport group, based in Aberdeen, Scotland.2012 Summer Olympics The 2012 Summer Olympics (officially the Games of the XXX Olympiad and also known as London 2012) was an international multi-sport event held from 27 July to 12 August 2012 in London, England, United Kingdom. The first event, th ...

and the

2014 Commonwealth Games The 2014 Commonwealth Games ( gd, Geamannan a' Cho-fhlaitheis 2014), officially known as the XX Commonwealth Games and commonly known as Glasgow 2014, ( sco, Glesca 2014 or Glesga 2014; gd, Glaschu 2014), was an international multi-sport ev ...

, which were held in

and

Glasgow Glasgow ( ; sco, Glesca or ; gd, Glaschu ) is the most populous city in Scotland and the fourth-most populous city in the United Kingdom, as well as being the 27th largest city by population in Europe. In 2020, it had an estimated popu ...

respectively. These operated under the license of First Games Transport, providing shuttle services throughout the Games before being dispersed to other operators within the FirstGroup following the Games' conclusion. 60 Enviro400s were delivered to Glasgow in 2014. Later in 2014, eighteen Enviro400s were delivered to

First West Yorkshire First West Yorkshire operates both local and regional bus services in West Yorkshire, England. It is a subsidiary of the FirstGroup, and is made up of three sub-division brands: First Bradford, First Halifax, Calder Valley & Huddersfield and Firs ...

for operation in

Leeds Leeds () is a city and the administrative centre of the City of Leeds district in West Yorkshire, England. It is built around the River Aire and is in the eastern foothills of the Pennines. It is also the third-largest settlement (by popul ...

. In 2008, a specially converted Enviro400 was assembled in

knock-down kit A knock-down kit (also knockdown kit, knocked-down kit, or simply knockdown or KD) is a collection of parts required to assemble a product. The parts are typically manufactured in one country or region, then exported to another country or region ...

form for the closing

ceremonies A ceremony (, ) is a unified ritualistic event with a purpose, usually consisting of a number of artistic components, performed on a special occasion. The word may be of Etruscan origin, via the Latin '' caerimonia''. Church and civil (secula ...

of the

2008 Summer Olympics The 2008 Summer Olympics (), officially the Games of the XXIX Olympiad () and also known as Beijing 2008 (), were an international multisport event held from 8 to 24 August 2008, in Beijing, China. A total of 10,942 athletes from 204 Nat ...

and

2008 Paralympic Games The 2008 Summer Paralympic Games (), the 13th Summer Paralympic Games, took place in Beijing, China from September 6 to 17, 2008. As with the 2008 Summer Olympics, equestrian events were held in Hong Kong and sailing events in Qingdao. It was f ...

Beijing } Beijing ( ; ; ), Chinese postal romanization, alternatively romanized as Peking ( ), is the Capital city, capital of the China, People's Republic of China. It is the center of power and development of the country. Beijing is the world's Li ...

. The bus featured as part of the handover ceremony for the

2012 File:2012 Events Collage V3.png, From left, clockwise: The passenger cruise ship Costa Concordia lies capsized after the Costa Concordia disaster; Damage to Casino Pier in Seaside Heights, New Jersey as a result of Hurricane Sandy; People gat ...

Games A game is a structured form of play, usually undertaken for entertainment or fun, and sometimes used as an educational tool. Many games are also considered to be work (such as professional players of spectator sports or games) or art (suc ...

, where it was driven into the

Beijing National Stadium The National Stadium (), also known as the Bird's Nest (), is an 80,000-capacity stadium in Beijing. The stadium was jointly designed by architects Jacques Herzog and Pierre de Meuron from Basel-based architecture team Herzog & de Meuron, p ...

as a typical London bus before a set of hydraulic pumps opened up the bus, revealing a stage covered in artificial grass which was shaped as various London landmarks. In 2012,

Southern Vectis Southern Vectis is a bus operator on the Isle of Wight. The company was founded in 1921 as "Dodson and Campbell" and became the "Vectis Bus Company" in 1923. The company was purchased by the Southern Railway before being nationalised in 1969. ...

received 20 for school contracts on the

Isle of Wight The Isle of Wight ( ) is a county in the English Channel, off the coast of Hampshire, from which it is separated by the Solent. It is the largest and second-most populous island of England. Referred to as 'The Island' by residents, the Is ...

. These were delivered during late December 2012 and early January 2013 and entered service on a wide variety of school services on the island from 7 January 2013. Southern Vectis then proceeded to order ten more Enviro400s to be used on public routes, mainly route 9, which entered service in January 2014, followed by another order for ten Enviro400s which were delivered in 2016. Between 2014 and 2015 Arriva North West received a total of 128 integral Enviro400s for a number of services on

Merseyside Merseyside ( ) is a metropolitan and ceremonial county in North West England, with a population of 1.38 million. It encompasses both banks of the Mersey Estuary and comprises five metropolitan boroughs: Knowsley, St Helens, Sefton, Wir ...

- with 28 arriving in 2014 and the remainder being delivered between January and July 2015.

Arriva Buses Wales Arriva Buses Wales ( cy, Bysiau Arriva Cymru) is a bus operator providing services in northern Wales and Chester in northern England. It is a subsidiary of Arriva UK Bus. History Crosville Motor Services was formed in 1919 and operated serv ...

received a total of 29 high specification Enviro400s between June 2014 and March 2015 for deployment on two new

Sapphire Sapphire is a precious gemstone, a variety of the mineral corundum, consisting of aluminium oxide () with trace amounts of elements such as iron, titanium, chromium, vanadium, or magnesium. The name sapphire is derived via the Latin "sa ...

services between

Rhyl Rhyl (; cy, Y Rhyl, ) is a seaside town and community in Denbighshire, Wales. The town lies within the historic boundaries of Flintshire, on the north-east coast of Wales at the mouth of the River Clwyd ( Welsh: ''Afon Clwyd''). To the we ...

and

Llandudno Llandudno (, ) is a seaside resort, town and community in Conwy County Borough, Wales, located on the Creuddyn peninsula, which protrudes into the Irish Sea. In the 2011 UK census, the community – which includes Gogarth, Penrhyn Bay, Craig ...

and

Chester Chester is a cathedral city and the county town of Cheshire, England. It is located on the River Dee, close to the English–Welsh border. With a population of 79,645 in 2011,"2011 Census results: People and Population Profile: Chester Loca ...

and

Connah's Quay Connah's Quay ( cy, Cei Connah), known locally as "The Quay" and formerly known as Wepre, is a town and community in Flintshire, lying within the Deeside conurbation along the River Dee, near the border with England. It is the largest town in ...

respectively.

Enviro400H

Alexander Dennis launched the hybrid electric Enviro400 Hybrid (often shortened to Enviro400H) at the 2008 Euro Bus Expo, built with a hybrid drivetrain developed in partnership with

BAE Systems BAE Systems plc (BAE) is a British multinational arms, security, and aerospace company based in London, England. It is the largest defence contractor in Europe, and ranked the seventh-largest in the world based on applicable 2021 revenue ...

. The first five production examples entered service with Metroline, followed by larger fleets of Enviro400Hs entering service with operators such as

Go-Ahead London Go-Ahead London is the trading name used collectively for the London bus operations of the Go-Ahead Group. The name first appeared in August 2008, before which the company had traded under separate names and brands. It is currently (as of 2021 ...

, London United,

Abellio London Abellio London is a bus company operating services in Greater London. A subsidiary of Abellio, it operates services under contract to Transport for London (TfL). Until September 2018, services were operated in Surrey under the Abellio Surrey ...

and

. Outside of London, the Enviro400H was popular with the Stagecoach Group, who starting in 2010, ordered examples delivered in a green variant of the standard Stagecoach livery for their

Stagecoach Oxfordshire Stagecoach in Oxfordshire is the trading name of Thames Transit Ltd. It is a bus operator serving the county of Oxfordshire, England. Since 1997 has been a subsidiary of Stagecoach Group, and since February 2021 it has been part of Stagecoach ...

Stagecoach Yorkshire Stagecoach Yorkshire is an operating division of Stagecoach Group. It was formed in 2005 to take over the former Traction Group fleets in Yorkshire by Stagecoach Group, which took over Traction from Frank Carter on 14 December 2005; Yorkshire ...

Stagecoach Manchester Stagecoach ManchesterCompanies House extract company no 2818654

, and

Stagecoach North East Stagecoach North East operates both local and regional bus services in County Durham, Northumberland, North Yorkshire and Tyne and Wear, England. It is a subsidiary of the Stagecoach Group, which operates bus, coach, rail and tram services acros ...

subsidiaries. Other operators who purchased Enviro400Hs included National Express West Midlands and

National Express Dundee Xplore Dundee is a bus operator based in Dundee, Scotland, operating services mainly within Dundee City. The operator also runs a service to Edinburgh Airport. It is a subsidiary of McGill’s Buses, which is based in Greenock, Scotland. Histo ...

, ordering a total of nineteen for service in

and

Dundee Dundee (; sco, Dundee; gd, Dùn Dè or ) is Scotland's fourth-largest city and the 51st-most-populous built-up area in the United Kingdom. The mid-year population estimate for 2016 was , giving Dundee a population density of 2,478/km2 or ...

in 2013;

East Yorkshire Motor Services East Yorkshire operates both local and regional bus services in the East Riding of Yorkshire and North Yorkshire, England. Prior to acquisition by the Go-Ahead Group in June 2018, the company was known as East Yorkshire Motor Services. History ...

, who purchased ten for cross-city services in

Kingston upon Hull Kingston upon Hull, usually abbreviated to Hull, is a port city and unitary authority in the East Riding of Yorkshire, England. It lies upon the River Hull at its confluence with the Humber Estuary, inland from the North Sea and south- ...

in 2011;

Reading Buses Reading Buses is a bus operator serving the towns of Reading, Bracknell, Newbury, Slough, Windsor, Maidenhead, Wokingham and the surrounding areas in the counties of Berkshire, Oxfordshire, and Hampshire, England, as well as parts of Greater ...

, who had 31 Enviro400Hs delivered between 2010 and 2011;

Lothian Buses Lothian Buses is a major bus operator based in Edinburgh, Scotland. It is the largest municipal bus company in the United Kingdom: the City of Edinburgh Council (through Transport for Edinburgh) owns 91%, Midlothian Council 5%, East Lothi ...

, who took on 15 of the type in 2011; the Oxford Bus Company, who took on examples to upgrade its

park & ride A park and ride, also known as incentive parking or a commuter lot, is a parking lot with public transport connections that allows commuters and other people heading to city centres to leave their vehicles and transfer to a bus, rail system (rap ...

fleet, and First Glasgow. However, reliability issues and maintenance costs have seen many operators convert their Enviro400Hs to use diesel powertrains, with East Yorkshire providing most of these conversions, while Reading Buses converted one of their Enviro400Hs to a plug-in electric vehicle.

Scania Enviro400

Scania AlexanderDennis Enviro400 EF09 OXF Oxford SpeedwellSt

Stagecoach announced on 28 February 2007 that it had ordered 25 Enviro400s with Scania N230UD chassis, which were subsequently delivered in early 2008. These were followed by another 56 for delivery in 2009, 100 for 2009/10, 100 for 2010/11, 91 for 2011/12 and 57 for 2012/13. Five were delivered to

Stagecoach in Lincolnshire Stagecoach Lincolnshire is a bus company, formerly known as Lincolnshire RoadCar, which runs services throughout Lincolnshire. Stagecoach in Lincolnshire is the trading name of the Lincolnshire Road Car Company Limited, which is a subsidiary of ...

in 2012 for

Lincolnshire InterConnect Lincolnshire InterConnect is a rural bus network in the county of Lincolnshire in the east of England. A number of ''InterConnect''-branded interurban bus routes with fixed timetables are complemented by demand-responsive, flexible ''CallC ...

service 6, serving

Skegness Skegness ( ) is a seaside town and civil parish in the East Lindsey District of Lincolnshire, England. On the Lincolnshire coast of the North Sea, the town is east of Lincoln and north-east of Boston. With a population of 19,579 as of 2011, ...

, Horncastle and

Lincoln Lincoln most commonly refers to: * Abraham Lincoln (1809–1865), the sixteenth president of the United States * Lincoln, England, cathedral city and county town of Lincolnshire, England * Lincoln, Nebraska, the capital of Nebraska, U.S. * Lincol ...

. Another significant operator of Scania Enviro400s is

Nottingham City Transport Nottingham City TransportCompanies House extract company no 2004 ...

, who ordered a total of 62 Scania N230UD Enviro400s, with first deliveries beginning in 2014. Further examples were delivered throughout 2014 and 2015, with most receiving colour-coded route branding for services across the city. These Scania Enviro400s were delivered with audio-visual next stop announcements,

mood lighting Mood lighting is igniting or illumination, designed to create a temporary state of mind or feeling. Effects of lighting on humans Field studies have shown in office settings that blue-enriched lighting over the course of several weeks can lead ...

and leather seating. The Oxford Bus Company received eleven high-specification Scania Enviro400s in 2009 for service on the Brookesbus network. Wilts & Dorset also received some examples. Two were delivered to independent operator Stephensons of Essex in 2013.

Volvo Enviro400

On 13 October 2006, Solent Blue Line received a

/Enviro400 meeting the Euro III emission standard, with the interior in

Wilts & Dorset Wilts & DorsetCompanies House extract company no 1671355
Wi ...

livery. This remains a one-off as all subsequent Enviro400s on

Volvo The Volvo Group ( sv, Volvokoncernen; legally Aktiebolaget Volvo, shortened to AB Volvo, stylized as VOLVO) is a Swedish multinational manufacturing corporation headquartered in Gothenburg. While its core activity is the production, distributio ...

chassis were built on the B9TL chassis. An Arriva demonstrator was shown at Euro Bus Expo in 2006 to the latter standard. Irish municipal operator

Dublin Bus Dublin Bus ( ga, Bus Átha Cliath) is a State-owned bus operator providing services in Dublin. By far the largest bus operator in the city, it carried 138 million passengers in 2019. It is a wholly-owned subsidiary of Córas Iompair Éireann. ...

was the first operator to order the

-based Enviro400, taking delivery of 100 on the updated Volvo chassis in two batches between 2007 and 2008. East Yorkshire Motor Services later took delivery of five Enviro400-bodied

in December 2007, which entered service in January 2008. London General also received three Enviro400-bodied Volvo B9TLs in October 2008, which were evaluated against integral Enviro400s and

Wright Eclipse Gemini The Wright Eclipse Gemini is a Low-floor bus, low-floor double-decker bus body that was built by Wrightbus since 2001, based on the single-deck Wright Eclipse design. The second-generation Eclipse Gemini 2 was launched in 2009, followed by the ...

-bodied Volvo B7TL and B9TLs extensively featured in Go-Ahead's

London Central London Central is a bus company operating in South London. It is a subsidiary of the Go-Ahead Group and operates services under contract to Transport for London. History London Central commenced operating on 1 April 1989 when London Bus ...

and General fleets. No further orders resulted in the United Kingdom, although London General's Enviro400s were briefly loaned to

Arriva London North Arriva London is a major bus company operating services in Greater London. It is a subsidiary of Arriva UK Bus and operates services under contract to Transport for London. It was formed in 1998 from a fusion of previously separate Arriva s ...

for evaluation ahead of delivery of their Volvo B5LHs.

Exports

Globally, more than 6,000 integral Enviro400s have been sold as of January 2016.

Hong Kong

3855 at Stanley Village (20181126103604)

AD01 at HZMB Hong Kong Port (20181025150146)

Citybus received two air-conditioned Enviro400 demonstrator (7000-7001) for evaluation in 2009. They are equipped with 8.9L Cummins ISLe engine and ZF Ecolife 6AP1403B gearbox. In November 2010, an extra order of 38 Enviro400s (7002-7039) were placed, these buses had a denser seat configuration and entered service in 2011. A further order of 20 Enviro400s (7040-7059) had been placed and these buses started to enter service in 2013.

MTR Corporation MTR Corporation Limited is a majority government-owned public transport operator and property developer in Hong Kong which operates the Mass Transit Railway, the most popular public transport network in Hong Kong. It is listed on the Hon ...

also ordered nine Enviro400s (140-148) for

MTR Bus MTR Bus is a public bus service in Hong Kong operated by the MTR Corporation. It serves the northwestern part of the New Territories. Also known as MTR Feeder Bus (previously operated by the Kowloon-Canton Railway Corporation as KCR Feeder B ...

service, these buses entered service in 2012. Two more Enviro400s (149-150) entered service in 2018. All of them are equipped with ZF Ecolife gearbox Kowloon Motor Bus received a Enviro 400 demonstrator (ATSE1) in 2009, it entered service in February 2010 and equipped with a 8.9L Cummins ISLe engine and ZF Ecolife 6AP1403B gearbox. A further 50 Enviro400s (ATSE2-51) were ordered in 2012 and registered between 2012 and 2013. They are designed with a denser seats configuration and equipped with a Voith DIWA 864.5 gearbox.

New World First Bus New World First Bus Services Limited (NWFB) is the third-largest bus operator in Hong Kong. Established by NWS Holdings and FirstGroup in September 1998, it took over 88 China Motor Bus services in Hong Kong Island. Since 2020 it has been a s ...

ordered 60 low-height Enviro400s, these entered service in 2016 and 2017. They had a Cummins ISLe engine and Voith DIWA 864.5 gearbox.

New Lantao Bus The New Lantao Bus Company (1973) Limited, commonly known as New Lantao Bus or NLB, is a franchised bus company operating in Hong Kong. It mainly operates bus routes on Lantau Island. History NLB was formed in 1973 through the merger of three b ...

ordered 14 low-height Enviro400s, which are similar to New World First Bus' batch. They entered service from October 2018 and have served route 3M since January 2019.

North America

Alexander Dennis Enviro 400 (16302529900)

The Enviro400 was introduced to North America exclusively as an

open-top bus An open top bus is a bus, usually but not exclusively a double-decker bus, which has been built or modified to operate without a roof. Early buses were constructed without roofs but in more recent times they have only been built for tourist and s ...

for sightseeing purposes. It is not available as a public transport vehicle, unlike the similar

Alexander Dennis Enviro500 The Alexander Dennis Enviro500 (previously known as the TransBus Enviro500) is a three-axle double-decker bus built by Alexander Dennis (formerly by TransBus) in the United Kingdom. It was unveiled in 2002 and is one of the Enviro-series bus m ...

. On 11 November 2010, Alexander Dennis announced it had received an order for 10 Enviro400s from

Coach USA Coach USA, LLC is a holding company for various American transportation service providers providing scheduled intercity bus service, local and commuter bus transit, city sightseeing, tour, yellow school bus, and charter bus service across the ...

subsidiary Twin America, in New York.

Specifications

Internal layout

The Enviro400 features an innovative seating layout that maximises use of seating space on the lower deck by placing two forward-facing moulded seats onto the front nearside wheelarch box with a small luggage shelf on the rear half, and also (on full-height models) a single forward-facing moulded seat on the front off-side wheelarch hub between the driver's partition and the staircase.

Powertrain

The engine is a

six-cylinder The straight-six engine (also referred to as an inline-six engine; abbreviated I6 or L6) is a piston engine with six cylinders arranged in a straight line along the crankshaft. A straight-six engine has perfect primary and secondary engine balan ...

Cummins Cummins Inc. is an American multinational corporation that designs, manufactures, and distributes engines, filtration, and power generation products. Cummins also services engines and related equipment, including fuel systems, controls, air ...

driving through a

Voith The Voith Group is a German manufacturer of machines for the pulp and paper industry, technical equipment for hydropower plants and drive and braking systems. The family-owned company, which operates worldwide and has its headquarters in Heid ...

or ZF

automatic transmission An automatic transmission (sometimes abbreviated to auto or AT) is a multi-speed transmission used in internal combustion engine-based motor vehicles that does not require any input from the driver to change forward gears under normal driving ...

. The maximum speed, like all British buses, is electronically limited to . A hybrid-electric version of the powertrain was also available.

References

{{Alexander Dennis

Enviro400 The Alexander Dennis Enviro400 is a twin-axle low-floor double-decker bus that was built by the British bus manufacturer Alexander Dennis between 2005 and 2018. It replaced the Alexander ALX400, Dennis Trident (from which the Enviro400 was de ...

Double-decker buses Hybrid electric buses Low-floor buses Open-top buses Vehicles introduced in 2005