Setra is a brand owned by EvoBus and is a firm that is a subsidiary of Daimler-Benz.

The name Setra is derived from the German word ‘selbsttragend’ which means self-supporting. During the 1940s and the 50s, all the buses were basically a body that was mounted on top of the truck chassis.

The Setra 6 is the first bus with a unibody construction (also known as "unit body" it is short form for a unitized body and is very much different from monocoque bodies).  Also nicknamed as the ‘six-meter bus’ as it was just 6 metre in length, the it could seat 20 passengers with the last seats positioned above the rear-engine. 

The rear engine not only helped in noise reduction inside the cabin but also made it posiible for easier repair and maintenance.