The Alexander ALX400 (later known as the TransBus ALX400 and the Alexander Dennis ALX400) is a 2-axle double-decker low-floor bus body. It was built from 1997 to 2006 by Alexander and then TransBus International and then Alexander Dennis respectively.
- Webb, Mary; Clarke, Jackie (2007). Jane's Urban Transport Systems. Jane's Information Group. p. 376. Retrieved 17 February 2016.
- Collins, Michael (2000). Rail Versus Road in Ireland, 1900-2000:. Colourpoint. p. 49. ISBN 978-1-898392-37-8. Retrieved 17 February 2016.
- Payne, Jamie (July 11, 2015). "Arriva Midlands (4789) DAF DB250 ALX400 - S215 JUA". Flickr. Retrieved 17 February 2016.
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