Long-distance trains in the UK manage about the same, with 200km/h max, but for more of the track (and higher accel/decel)
The hourly Glasgow departure averages 105mph to Warrington
Once you get up north speeds drop -- the eng to end average for Glasgow-London is about 84mph (401 miles in 4h47), Edinburgh-London is a similar distance but a bit faster at about 4h26, so 89mph.
Washington DC to Boston is 440 miles and seems to take about 6h40 at best, just 66mph