Alexander ALX400
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The Alexander ALX400 (later known as the TransBus ALX400 and the Alexander Dennis ALX400) is a 2-axle double-decker bus body built by Walter Alexander Coachbuilders (later by TransBus International/Alexander Dennis). It was one of the ALX-series bodywork, all except ALX100 feature the same designs on the front and rear panels, built for new generation (mainly low-floor) bus chassis produced since late 1990s.
Released in 1997, it replaced the aging R-series bodies and was fitted to numerous chassis, including the Dennis/TransBus Trident, the DAF/VDL DB250LF and the Volvo B7TL. It proved a big success with national operators; huge numbers serve London and the rest of the United Kingdom. From its introduction until 2006, it has been the favoured double-deck model for the Stagecoach Group.
The ALX400 was also a big hit with Dublin Bus of Ireland, which ordered 658 between 2000 and 2006. 648 of them were fitted on Volvo B7TL chassis (numbered as the "AV"-class, which means Alexander Volvo, and "AX"-class) and each was capable of seating 76 passengers.
Various seating configurations were available, with Transport for London (TfL) specification models, fitted with a central exit door. There are typically 45 seats on the upper deck, and between 17 (on the DAF DB250) and 22 seats on the lower deck. Longer models for use elsewhere have up to 47 seats on the upper deck, and 24 below with a central door. Stagecoach subsidiaries outside London have ALX400s on long-wheelbase Dennis Trident chassis, fitted with 51 seats upstairs (47 on later models) and 28 downstairs.
In late 2005 Alexander Dennis launched the Enviro 400 model, intended as a replacement for the ALX400. But in 2006, new ALX400s were still entering service with Stagecoach (on Dennis Trident 2 chassis) and Arriva (on Volvo B7TL chassis). Despite the bulk of the 2006 Stagecoach double-deck order favouring the Enviro 400 model, also chosen by London operator Metroline, in March 2006 Dublin Bus placed a repeat order for 100 of the type on Volvo B7TL chassis. Production of the ALX400 bodywork ceased after the delivery of these 100 ALX400-bodied Volvo B7TL in late 2006.
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