Iraq has said has narrowed down the number of companies competing to build country's first metro to eight foreign firms and expected the project to cost $3bn-$4bn, Reuters has reported. The companies include France's Systra, Britain's Pell Frischmann and Cyril Sweett Group Plc, US firms Parsons Brinckerhoff and Aecom, Germany's RMS, Turkey's Makyol and Mebex, a Lebanese firm.