Turkish State Railways’ (Turkiye Cumhuriyeti Devlet Demiryollari, or TCDD) plans to build a 6,000-kilometers network of high-speed track have received a major boost from China. Chinese Premier Wen Jiabao signed an agreement in early October in Ankara to loan approximately $28 billion for construction of a 2,000-km high-speed Silk Road Railway. The route will connect Edirne, which is on Turkey’s western border with Bulgaria, and Kars, which is in the northeast near the closed border of Armenia. The Kars–Tbilisi–Baku conventional railway—which links Turkey, Georgia and Azerbaijan—has been under construction since 2007 and is scheduled for completion by 2012. + Image
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.