Rio's metro: the biggest construction project for the Olympics After the Olympic Games, the extension of Rio de Janeiro's metro is expected to remain the biggest positive legacy, helping to link a city that has struggled to overcome the complicated geography of steep hills and Atlantic coastline. Work on Rio de Janeiro’s metro is in its final stage, with 650 left meters to dig. The line under construction in Brazil is considered the biggest in Latin America, and a great advancement in transportation for the city. IMAGES AND SOUNDBITES of the under secretary of transportation for the state of Rio de Janeiro