Despite the financial crisis in southern European Union countries, the Portuguese government has launched construction of a $1.9-billion high-speed railroad to the Spanish border. But it has delayed bidding for a 13-km-long bridge that would carry the line north into Lisbon over the Tagus River. Map: RAVE Photo: RAVE The financial crisis has delayed bids on 13-km-long Tagus River crossing. Portugal’s first high-speed line will extend 165 km from Poceirão, some 34 km south of Lisbon, to Caia, halfway between Elvas, Portugal, and Badajoz, Spain. Due for completion in about four years, the line will carry trains running up to
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.