A green transportation policy combined with years of underinvestment is spurring a boom in Denmark's railroad infrastructure. Among projects steaming ahead is a $3-billion installation of new signaling technology across the Scandinavian nation's 2,300-kilometer network. Photo: Peter Reina Major rail projects, including on Copenhagen’s system, are under way. Denmark early last year launched its so-called Green Transportation Policy through 2020. With the government shifting investments from roads to rail, "2009 was a historic year for us," says Palle Beck Thomsen, managing director for Atkins Danmark A/S, the country's largest railroad design firm. Intensifying emphasis on rail is doubling the sector's
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.