[seanmcdirmid]

China is even more densely packed behind the Heihe–Tengchong Line. Oh, don't misunderstand, China has it even harder than we do, if you look at eastern China...where people live, a lot of it is not flat and they are tunneling through lots of mountains to make these HSR lines work. Actually, that might make it easier for them, since their population is much more focused (no room for huge suburbs), and their only real challenge is building tunnels and viaducts.