page_title: Alexander Dennis Enviro500
section_title: Second generation (2012–present)
hierarchical_section_title: Alexander Dennis Enviro500 / Second generation (2012–present)
caption_attribution_description: English: Citybus 8400 Hybrid Bus
context_page_description: The Alexander Dennis Enviro500 is a three-axle double-decker bus built by Alexander Dennis in the United Kingdom. It was unveiled in 2002 and is one of the Enviro-series bus models made by TransBus/Alexander Dennis.
  The second generation Enviro500, also known as the Enviro500 MMC or Enviro500 USA Standard, was launched in 2012, replacing the original version.
context_section_description: In 2012, Alexander Dennis unveiled a new generation Enviro500 (also known as the Enviro500 MMC) with a new chassis design. The chassis (also known as the Trident E500 Turbo and E50D/E50H) had the longitudinally-mounted engine and gearbox slightly offset to the left. The Cummins ISLe engine was retained, with choices of ZF EcoLife and Voith DIWA gearbox. Like the Enviro400 with straight staircase, the shape of fuel tank was specifically adopted to be mounted under the staircase. All the axles utilised were supplied by ZF instead of Dana.
  The bodywork was also redesigned, with a more angular front-end design based on the Hong Kong version of the Enviro400. It has a new design of staircase known by Alexander Dennis as the "Square-Case", whose size was similar to that of the spiral staircase but with all steps being rectangular shaped.
  A hybrid-electric version of this bus model with a Cummins ISBe engine and the BAE Systems HybriDrive series hybrid system had been built in small numbers.
  Later in 2014, Alexander Dennis unveiled this second generation Enviro500 in North America, with a new design of bodywork similar with the Enviro400 MMC launched earlier that year, featuring rounded top edges and a vertically oriented headlamp cluster. This bodywork design was also adopted by the Enviro500s built for Hong Kong since 2015.
  Two versions of the Enviro500 have been developed for the North American market: the standard 4.1 m (13 ft 5 ³⁄₈ in) height model with a length of 12.9 m (42 ft 3 ⁷⁄₈ in), and a new, lower-height 3.9 m (12 ft 9 ¹⁄₂ in) Super-Lo variant with a longer length of 13.8 m (45 ft 3 ¹⁄₄ in), designed for high-capacity, interurban transport.
caption: Citybus's Enviro500 hybrid energy bus.
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