 They have the same basic design, bodyshell and core structure as the Turbostar diesel multiple unit (DMU), which is in turn the most common post-privatisation diesel multiple unit family, and both evolved from the Class 168 "Clubman" design by Adtranz.The 357s are operated by c2c on the London, Tilbury and Southend Railway.The Clubman/Turbostar/Electrostar platform is a modular design, optimised for speedy manufacture and easy maintenance.