As part of his infrastructure investment agenda, President Obama has called for building a national network of high-speed passenger trains that would serve 80% of all Americans by 2036. Such a network would be great for America. Unfortunately, we can’t afford it. True high-speed rail, which is defined as exceeding 200 mph, is extremely expensive to build. The $53 billion President Obama proposed spending over six years for HSR would be just a down payment. A San Francisco-Los Angeles line alone would cost $42 billion. With national debt at record levels, we do not have the funds for big, new
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.