Alexander Dennis Enviro400

The Alexander Dennis Enviro400 is a double-decker low-floor bus built by Alexander Dennis. There have been three generations since 2005.

Alexander Dennis Enviro400

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Manufacturer	Alexander Dennis
Production	2005–2018
Predecessor	Alexander ALX400, Dennis Trident 2, Plaxton President
Successor	Alexander Dennis Enviro400 MMC
Engine(s)	Cummins ISBe/ISCe/ISLe (Enviro400) MAN D0836 (Enviro400) Volvo D7C (Volvo B7TL) Volvo D9B (Volvo B9TL) Scania DC9 (Scania N230UD)
Transmission(s)	Voith or ZF
Length	10.1 m (33 ft 2 in) to 11.4 m (37 ft 5 in)
Width	2.55 m (8 ft 4 in)
Height	4.2 m (13 ft 9 in) to 4.3 m (14 ft 1 in)
Curb weight	11 tonnes (10.8 long tons; 12.1 short tons)

First generation (2005–2010)

The Enviro400 was built in 2005, The chassis could be built on the East Lancs Myllennium Lolyne, Optare Olympus and Scania N-series (N230UD and N280UD) bodies.

One Enviro400 was built on the Volvo B7TL chassis before Volvo B7TL was replaced by the Volvo B9TL, on which more examples of the Enviro400 were bodied.

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  The first production Enviro400, Stagecoach 19000 Spirit of London, new in 2005, pictured in 2014

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  First generation Enviro400 rear

Second generation (2008–2018)

The second generation Enviro400 was launched in 2008. It had white LED daytime running lights underneath the headlights at the front, new front bumpers and the emergency exit door was in a different place.

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  A second generation Enviro400 operated by First Greater Manchester

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  Second generation Enviro400 rear

Third generation (2014–present)

The third generation Enviro400 (known as the Enviro400 MMC) was launched in May 2014.

It had new front and rear lights, new front and rear bumpers, new windscreen and a new interior.

E400H

A diesel-electric hybrid version, called the Enviro400H, was launched in October 2015.

E400H City

A hybrid version, called the Enviro400H City, was launched in October 2015. It is aimed at the London market, and is visually similar to the New Routemaster and Enviro200 MMC. The Enviro400H City is only sold as a hybrid in London to compete with the New Routemaster.

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  A third generation Enviro400 MMC operated by Unibus

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  Third generation Enviro400 MMC rear

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  Arriva London Enviro400H City on route 78 in Shoreditch in December 2015

Alexander Dennis Enviro400 Media

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  First generation (left) and second generation (right) Enviro400s of National Express Coventry, photographed in May 2022

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  A Stagecoach Yorkshire Enviro400 Hybrid in the company's hybrid livery in Sheffield

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  An Oxford Bus Company Scania N230UD Enviro400 in February 2013

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  A Dublin Bus Volvo B9TL Enviro400 in Dublin, Ireland

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  A Kowloon Motor Bus Enviro400 in Mong Kok, Hong Kong

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  New World First Bus Enviro400 with facelift Enviro400 MMC bodywork

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  Open Loop New York Enviro400 open top bus in New York