In a unified structure, he argues, contractual relationships are simplified and train operators are in sole control of their performance.

ECONOMIST: A better way to run a railway

And I think if we're looking at bringing a unified structure together, giving coherence to the industry then it may be one of the things that we'll need to look at.

BBC: News Online

In December, more than 260 leaders of the main FSA units from across Syria agreed at a meeting in Antalya to a unified command structure.

BBC: Syria rebel commander Riad al-Asaad wounded by blast

Unibody construction, in which a vehicle's roof, door frames and floor pan are part of a unified, rigid structure, has made vehicles lighter and stiffer.

CNN: Fat and fast: High-performance gets big