I took the Acela Express from Philadelphia to New Haven last Dec. 10. It was nice to turn on the Speedometer App on my smartphone, and see that the train went over 150 mph, north of Trenton. However, the app also showed my history, where I had clocked the Thalys high speed train from Brussels to Paris last October at 218 mph. Took just over an hour and twenty minutes from Brussels to Paris. That same trip, when I first took it in 1986 took almost 5 hours.
London St-Pancras to Paris Gare du Nord covers 214 miles in 2 hours and 20 minutes
The issue is New Haven to New Rochelle and there is no easy solution if indeed there is one.
In September 2018 while working for the NHL Bruins I took an overnight train from Beijing to Shenzhen that took around 9 hours - the distance was similar to going from Boston to Tampa