The initiative entails building 20km of railway with 24 stations between the Brazilian city's Barra de Tijuca and Recreio neighborhoods.
Ecuador's President Rafael Correa, in the last two months of his presidency, is speeding up construction of schools as part of a bid to rebuild infrastructure following last year's earthquake.
The second stretch of the Ruta del Sol highway, originally due to be fully finished this year, will now not be completed until 2022, the head of the country's infrastructure agency says.
Court ruling a blow to campaigners seeking to halt the mega project which involves building a 276km interoceanic canal and other infrastructure.
The country's social security institute seeks bids to build a hospital in Mexico state and receives offers for construction of another in border state Coahuila.
The group cites a stronger performance by its highway and airport concessions and its construction business.