Map by ENR The North-South Transnational Corridor project aims to be the most direct link for freight shipments from Russia or Central Asia to the Persian Gulf. Related Links: The Ten Most Noteworthy Rail Projects: Overview and Related Stories Project: North South Transnational CorridorCost: $1.4 billionConstruction period: 2007-2012 Central Asian nations have been slow to establish rail links with their neighbors to the south for numerous reasons. During the era when the Central Asian nations were part of the Soviet Union, all their rail lines headed north to Russia, their major trading partner.Of the five Central Asian nations, Kazakhstan occupies
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.