Line No. 3 of the Chilean capital's subway is expected to benefit 1.1mn passengers.
Retired army general Antonio Leite dos Santos Filho is the new head of DNIT.
The Dubai-based operator plans a public tender offer on the Santiago stock market for 100% of Pulogsa's shares.
The Mulalo-Loboguerrero concession is awaiting the approval of environmental watchdog ANLA and works are expected to start in April.
The line will link the city's eastern district of Iztapalapa to Ixtapaluca, a neighboring municipality in Mexico state.