As most of you who might be affected probably know, Amtrak has canceled both its Acela and regional service between New York and Boston over the June 16-19 stretch (updated; the work was originally scheduled for June 14-17). The culprit is the Thames River Bridge, which is old and in desperate need of repair.
If you need to travel during that time, there are the other usual choices: flying, driving, or taking the bus. The BoltBus, which I wrote about a few weeks ago, is probably the most cost-effective for the level of comfort that you get, with fares under $30. If you'd usually be riding First Class on the Acela, though, you might prefer the Limoliner, which has between three and six departures per day in each direction. It's not cheap--you can expect to pay around $90 each way--but that's still a savings versus an Acela ticket.
It's also a nice trip, with the same two-one seat configuration you'd find in First Class along with per-seat power outlets, WiFi for Internet access, movies, and even meal service provided by an onboard attendant (who is guaranteed to be competent and friendly, whereas Amtrak has a hard time promising either and rarely delivers both).
So during the Amtrak outage, take the opportunity to give one of these alternative methods of travel a try. I'll always be a supporter of passenger rail, but the real goal is to get from A to B at a cost and with a level of comfort that's right for you. Might as well see what's available.