Grampet said the Romanian consortium had filed the papers for the prequalification phase of the auction, which will be followed by contract negotiations and ultimately, the winner will be selected.
According to the statement, the prequalification phase is expected to be completed by the end of January.
Other bidders include French Alstom, Czech Skoda, as well other companies in Russia and Hungary.
Grampet Group, with a turnover of EUR230 million at the end of 2013, ended the first nine months of 2014 with a slightly higher turnover compared to the same period in 2013.
Astra Vagoane Arad is held by businessman Valer Blidar.