Nurol, Astaldi and CAF consortium lowest bidder for Dubai Metro Red Line extension May 3, 2016 | Middle East & Africa Company News A consortium of Turkey-based Nurol, Italy-based Astaldi and Spain-based Construcciones y Auxiliar de Ferrocarriles (CAF) has submitted the lowest commercial offer for the design-build contract for Dub... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password