"...China’s new goal is to continue on with a HSR revolution internationally in order to create two-day HSR trip times between Beijing and London."
A 48 hr trip would have to average just over 100mph. Maybe, if it's got some pretty limited stops.
London to Beijing takes about 9-10 days as of right now. You could easily get that to 5-7 days if you cut out stops (especially between Moscow and Beijing) and if you tripled the average speed of the trains from ~30-40 mph to 90-120 mph... there you go, although the latter part is what requires so much money and engineering.
Good question. Wouldn't that still take almost a week?