Alexander Dennis Enviro400

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Alexander Dennis Enviro400
Metroline London 671-a.jpg
Years of manufacture 2005 to present
Length 10.4 or 11.5 metres
Width 2550 millimetres
Stagecoach in Manchester 19421.jpg

The Alexander Dennis Enviro400 is a two-axle double deck bus. The chassis was developed from the popular Trident. Metroline in London, England was the launch customer for the Enviro400 in 2005.

The modular chassis is made from welded steel sections and treated with corrosion resistant two-pack epoxy. The aluminium body is integrated with the chassis using clean frame joints, and the dissimilar metals are treated with dielectric paint to prevent corrosion.

The Enviro400 chassis can be fitted with bodywork from other suppliers. Likewise, the Enviro400 body can be fitted onto the Volvo Buses B9TL and the Scania N230UD chassis. There is one example of an Enviro400 body fitted on a Volvo B7TL chassis before the introduction of the B9TL.

On November 4, 2008, a diesel-electric series hybrid version called the Enviro400H was unveiled at the Euro Bus Expo in Birmingham, England.

Contents

Design history

An Enviro400 operating in Hong Kong.
Open-top Enviro400 operating in Canada.
The Euro 5 Enviro400 chassis was revised with the radiator on the offside and the engine on the nearside. The engine was originally mounted on the offside due to the layout of the ZF rear axle. A new axle layout allowed for a simplified straight angle drive. The revised Enviro400 also has an additional 50 millimetres of ground clearance.[1]

A revised Enviro400 body debuted at the 2009 Coach & Bus Live. A line of white LED lights was incorporated under the existing headlights, and new curves were added on the front bumper.

The first Enviro400 buses to operate in Hong Kong (for Citybus and Kowloon Motor Bus) were delivered in 2009. They feature a large HVAC system and the updated front fascia. Further exports of the Enviro400 were made to Canada and the United States, however only as an open-top sightseeing bus. One of the first orders was placed in 2010 for 10 Enviro400 buses from Coach USA subsidiary Twin America, in New York.[2] The front and rear of the export variants' top deck share the design of the Enviro500 respective of region.

The Euro 6 Enviro400 was introduced in May 2014 and features a new look, new heating and ventilation system, new glazing system, decreased weight, and increased seating capacity. Under a Major Model Change project, Alexander Dennis worked with over 70 operators in a three-year period to improve the design of the Enviro400.[3]

The updated Enviro400 continues with the curved and sloping front end. A new headlight cluster flows into the windshield and the front and rear bumpers are accented by a cut-out at the bottom. Glazing on the front and rear is flush-mounted to the body instead of gasket mounted as previously used. The rear around the engine flares outward gently. This is evoked on the front around the destination sign and windshield.

The interior was redesigned with elements to improve ergonomics and appeal for both passengers and drivers. The bus is able to seat one more person in a London configuration, five more in the hybrid model, and seven more in the full-length model. The bus now features Alexander Dennis's L-shaped "Square-case" staircase. The electrical system is housed within the body structure and is composed of modular sections for easier replacement.

The updated Enviro400 features Alexander Dennis's Quick Release Glazing (QRG) system. The window frame is attached to the body with its face flush with the body panels, and the glass is retained against the frame by a removable retainer. This allows the glass to be removed from inside the vehicle instead of from an external platform.[4]

Specifications (on Enviro400 chassis)

Operators

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Ireland

Scotland

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References

  1. Euro 5 Enviro400, alexander-dennis.com, retrieved on 2009-09-11
  2. ADL gears up for export drive with diesel and hybrid models, alexander-dennis.com, retrieved on 2010-11-12
  3. The all-new Enviro400 – designed by the industry for the industry. Alexander Dennis. 01 May 2014. Press release. retrieved on 03 May 2014.
  4. Patent WO 2013156802 A1
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