Today, 250 km/h traffic officially started in another country: Russia. The Sapsan (Siemens Velaro RUS, a descendant of the German ICE3) run on the upgraded Moscow-St. Petersburg mainline. However, I don't know any details: e.g. which parts of the line are fit for the new top speed, how much of that the trains are actually scheduled run at top speed, and what if any technical obstacles (signalling, tolerances, maintenance) might throw a hammer in the works.

_{*Lunatic*, n.
One whose delusions are out of fashion.}