The bid for one of the key infrastructure projects ahead of the 2016 Olympics was delayed last year to allow time for more companies to participate.

According to ANTT, in addition to a consortium led by South Korea's Hyundai Heavy Industries Co Ltd, at least two other undisclosed groups will bid for the high speed rail project, connecting the cities of Campinas, Sao Paulo and Rio de Janeiro.

Figueiredo said Brazilian construction companies were to lead the other two groups.

The venture, which could cost about $19 billion, has drawn criticism from Brazil's budget watchdog because the government has promised large subsidies to the winning bidder.

The bidding process was delayed last year to allow more companies to the chance to participate, but the final bid deadline 29 April is unlikely to be postponed again.

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