The project is the first to be awarded in a US$750mn program to improve the road network surrounding the Cristo Redentor border crossing with Chile.
The project involves the rehabilitation and widening of a Pan-American highway stretch running between the bridge of the Americas and the city of Arraiján.
The planned 1,000km freight railroad will connect Dourados in the Brazilian state of Mato Grosso do Sul with the port of Paranaguá, in Paraná state.
The country was stuck in a holding pattern as it awaited the return of VP Martín Vizcarra, who was expected to replace Pedro Pablo Kuczynski as president.
The presidents of both nations made official their agreement on the location where the new Sixaola border-crossing bridge will be built.
The engineering firm's failure to pay part of the fines included in a corruption-related leniency agreement, could prompt the country's antitrust agency to suspend the agreement, according to a local daily.
With current concessionaire ABV facing major financial problems, investment firm IG4 Capital and debt restructuring company Stardboard are interested in taking over the concession for the Viracopos airport in the Brazilian city of Campinas, according to a local newspaper.