The total cost of the Buenos Aires—Rosario—Córdoba line was calculated at US$ 4 billion. Four European firms presented themselves as bidders: Alstom (French), Siemens (German), CAF (Spanish) and Impregilo (Italian). Pre-contractual conditions stated that the national state will pay for the whole sum, but the firm in charge of the construction will finance 50%. When technical and financial bids were due in March 2007 only the Veloxia grouping of Alstom, Isolux Corsan, Iecsa and Emepa Group came forward, and the consortium was selected as preferred bidder on 20 June 2007.