I've taken Regional (Business Class) once and Acela (First) several times, to both NYC and Washington DC. Amtrak service in the northeast corridor is nothing short of outstanding. There are quirks and tradeoffs to consider, but they offer varying levels of service (regional vs acela, coach vs business vs first) at varying price points that would suit most travelers. I would recommend the very small upgrade price for Business service on Regional for less-cramped quarters (if you're going Regional), fewer other travelers, and a generally quieter experience (yes, even compared to the quiet car).
Regional service is definitely a good value, but if you want a First Class travel experience, you'll be hard-pressed to beat Acela First service. The lounges are okay, but at NY Penn, it is an absolute godsend on weekends -- the general waiting area is a complete zoo, so the lounge (available to Acela First and Amtrak elite-status passengers) is a nice respite. It's only marginally faster than a bus if traffic to NYC is light - but that's quite the risk, isn't it? Compared to flying (door-to-door, including security), Amtrak is far superior time-wise to most locations on the northeast corridor from Boston.
First Class service on Acela includes at-seat hot-food and beverage (including beer, wine, and cocktail) service from (usually two) attendants in the First Class car. The menu choices are generally quite good (and include a veggie option) -- on par with what you'll get on a good first-class airline trip, without all the drama, cramped quarters, and hassle. The bathrooms are generally kept quite clean, and there are power outlets at the seats. (This is true in business class on Regional and Acela as well -- not sure about Coach on Regional). My Regional train did not have wifi service, but Acela has reasonably reliable wifi service. (Don't expect high-speed service, but it's definitely sufficient for reliable browsing and email if you're trying to get work done). The seats on Acela also offer a nice view with large windows. (Seats on Regional have much smaller windows). If you want a nice view of the coast, sit on what will be the south-facing side of the train (on the left if you're sitting facing the front of the train in Boston, on the right if you're sitting facing the front from DC or NY - if you're unsure, ask a conductor... they're usually quite helpful). My wife and I take this trip together, and it's quite pleasant to sit, share a meal (or two) with wine, watch the countryside fly by, and arrive pretty much right at our destination. This experience is incredibly tough to beat when you're leaving from Boston.
People seem to sometimes get confused by the boarding process. It's basically first-come, first-served for seats as you board the train, so there's a line that forms outside south station. If you want earlier access to the line before your train's track number is posted, consider asking an Amtrak employee inside south station - they'll likely be able to tell you at least 30 minutes before the train leaves (and likely before the line has started forming). If you're going First Class on Acela, you'll get an opportunity to board before the general line is let through, but it is still first-come, first-served for seats in the First Class car. DO NOT stand in the general line if you've got a First Class ticket and boarding has been called (it will be announced early inside the Club Acela lounge, before the track is posted on the board in South Station). Rather than waiting in the line, walk past it to the Amtrak/Security staff at the front of the line, show them your First Class ticket, and board the train. (This is not clearly explained anywhere, but I had asked in the lounge my first time - again, the staff are generally quite helpful).
Price-wise, you don't get gouged quite as badly for waiting to buy tickets closer to your travel date as you would with an airline, but you still get better prices if you book farther out in advance. Acela is not cheap, so if you're not sure if train travel is for you, perhaps consider a Business Regional trip first. read more