[citation needed] The model shares the same bodyshell and core structure as the Bombardier Turbostar which is the most common post-privatisation diesel multiple unit (DMU) family; both evolved from the Class 168 Clubman design by ADtranz.

The Turbostar and Electrostar platforms are a modular design, sharing the same basic bodyshell and core structure, and optimised for speedy manufacture and easy maintenance.

A common underframe, created by seam-welding a number of aluminium alloy extrusions, is covered by body panels and topped by a single piece roof, again made from extruded sections.

[citation needed] The trains were assembled by UCW Partnership in South Africa from components made in Derby.

Production of the trains ended in 2017 when unit number 387174 for Great Western Railway was completed at Derby Litchurch Lane Works.

According to the Gautrain planning and implementation study,[15] this is done for several reasons, including that standard gauge is safer and more comfortable to passengers.

[citation needed] From September 2016 Great Western Railway introduced 45 4 car Class 387/1s on peak services between London Paddington and Hayes & Harlington.