Rio de Janeiro is pushing for high-speed-rail service in time for the 2014 Olympic Games. The Brazilian government plans to issue a concessionaire contract in May for a 510.7-kilometer-long high-speed-rail system to link the cities of Campinas, São Paulo and Rio de Janeiro. Construction costs are estimated at $19.3 billion, and the term of the concession is 40 years. + Image Image: Brazilian Government Related Links: China-Hong Kong Rail Line Costs Deepen London�s Massive Rail Project Gains Favor The Trem de Alta Velocidade (TAV) line will include nine stations, 90.9 km of tunnels and 107.8 km of bridges. Public consultations
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.