The Red Line South:QDVC JV South Korea’s GS Engineering and Construction & Qatar’s Al-Darwish Engineering

The Red Line North:mpregilo S.P.A. and SK Engineering & Construction and Qatar’s Galfar al-Misnad Engineering and Contracting

The Green Line:PORR Bau GmbH,Saudi Binladin Group & Qatar’s Hamad Bin Khalid Contracting.

major metro’s stations:Samsung C&T Corp &(OHL) and Qatar Building Company.

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