The initial bid filing deadline was April 22.
Romania has got the approval of international financial institutions to change the deadline, the ministry said.
The Transport Ministry will auction off 51% of CFR Marfa in June and the starting price is 798.05 million lei (EUR180 million).
The procedure will include three phases: prequalification, negotiation based on preliminary non-binding offers and sealed-bid auction.
Transport Minister Relu Fenechiu said Tuesday 12 key European companies are interested in CFR Marfa. (EUR1=RON4.3663)