Here's a report from CNN on the French TGV breaking its speed record in late March. It topped 564 kilometers (356.5 miles) per hour. Here also is a video of the event, shot inside the train, from the air and from a couple of stationary locations. The best moment comes when the train passes under a bridge; that's when you get a true impression of the vehicle's awesome speed.
Someday we may get the chance to whisk between the Bay Area and the Southland on one of these things.