Ten-fifteen years ago, there was a lot of discussion in the US about building high speed rail lines through various traffic corridors. As far as I know, nothing ever took place. Amtrak runs the Acela passenger line from NYC to DC, but that can hardly be classified as "High Speed" (it's only at "high speed" for 18 miles of its route). And it's the only one that I know of. The Chinese have just approved the construction of two high speed rail lines. What happened here? Also, what happened to MAGLEV tech? You don't hear about that either.