I took a “TGV Inoui” train from Luxembourg City to Paris last month. There are speed monitors in each car; we hit 317 kmph (197 mph) once we got to the actual high speed railway south of Metz. Whatever you think of France, the high speed train service there is marvelous.
I was in Scotland and took a train from Inverness to Glasgow. Nice trip and normal, everyday people on the train. Not sure how fast we went but the one thing I thought is....In the states these trains would turn into something like Greyhound bus. Something no one would use unless they had to.