Let's break down this little infrastructure project by the numbers. It was deemed "shovel ready" just 39 months ago. In that time, Chinese engineers and workers have erected 288 bridges and punched 21 tunnels through China's often difficult terrain. Some 80 percent of the track is laid 40 feet above the surrounding terrain on concrete pylons, circumventing the need for dangerous roadway crossings. Cost: roughly $34.2 billion.