Un Train Très Rapide

A new French train just broke the speed record for conventional trains, traveling between Paris and Strasbourg at over 350 mph. And I'm just happy when clunky old Amtrak makes it from NYC to DC without breaking down. The manufacturers of the French train were visited by a committee from California who are considering a state-long high speed line from San Diego to Sacramento, with stops in LA and SF. That would be fantastic, but like many, I look at this train and think "terrorism". How can you secure hundreds of miles of track?