Interesting, from https://www.amtrak.com/acela-train:
"Superior comfort, upscale amenities and polished professional service at speeds up to 150 mph, Acela offers hourly service downtown to downtown during peak morning and afternoon rush hours between New York, Washington, DC, Baltimore, Philadelphia and other intermediate cities, as well as many convenient round-trips between New York and Boston."
“And at only five times the cost of a Jetblue shuttle from JFK to Logan!”
Having lived between NY and Boston for most of my life, and being a massive fan of trains, I am always so disappointed this isn’t a more realistic option.