What is "turbostar"

Turbostar is the name given to a family of diesel multiple units (DMUs) built by Bombardier Transportation (previously ADtranz) at their Litchurch Lane Works in Derby, England. The Turbostar was the first new train type to be introduced after the privatisation of British Rail. The first units were ordered by Chiltern Railways in 1996 and were designated Class 168 (also known as Clubman). Since then the family has grown with the addition of the Class 170, Class 171, and the Class 172.