You taking about Acela’s “Business Class” that they say is business but isn’t really business and is just coach, or Acela “First Class” which really is the Business Class option? Ah, how I love Amtrak naming...Hope the fare delta is worth it to you. The Acela from PVD to NYP runs maybe 20 to 25 minutes faster than the regional. I've taken the Acela from WAS to NWK and WAS to NYP and found the regional almost a better bet because the Regional usually has some open seats in Business whereas the Acela is almost always full in Business.