High Quality Content by WIKIPEDIA articles! The Albion Nimbus was an underfloor-engined, ultra-lightweight (dry weight 2.4 tonne) midibus or coach chassis, with a four-cylinder horizontal diesel engine and a gross vehicle weight of six tons. It was happiest on light rural bus duties and private hires. Operators who used it on heavy-duty bus routes found it insufficiently robust. It was the first Albion bus chassis to have a name that did not begin with the letter V. The design was revised twice and was produced from 1955 to 1965.