A coastal railway, one of the government's biggest infrastructure projects, is becoming more likely with the timetable at hand.
The process is intended to improve the framework for private sector initiatives submitted to the system.
An official said that 12 groups based in Europe, Asia and US already expressed their interest to take part in the auction.
The Spanish firm's local subsidiary is negotiating with banks to finance works on two of its routes, according to a report.
The deal, estimated to be worth at least US$20mn, will allow Neltume and construction firm Belfi to each own a 50% stake in TPA.
The government also thinks it can obtain 30bn reais (US$8bn) in investments for the rail sector.
Both investment funds will pay around US$440mn for an 85% stake in Odebrecht TransPort's Rota das Bandeiras.