No, the Acelas are junk. They're a Frankenstein mashup of Bombardier and Alstom tech that are notorious shop queens and very nearly the most expensive trainsets to operate in the world. And Bombardier's onerous Service & Support contract with co-ownership clauses is so contentious and has so strained relations with AMTK that BBD is effectively blackballed from bidding on any more AMTK equipment. If the Acela service weren't so hugely profitable in spite of the vehicle contract, it'd be a major scandal.MBTA wants electric trains.
Amtrak is retiring the current Acelas in two years.
Providence-Boston is one of two spots where the Acelas work well.
The Acelas are old, yes, but their life could be extended by running on a short corridor rather than 500 miles every day. Could also do well limited to 135mph or some other random number.
Let's do it gang!
They're wholly inappropriate for commuter duty. Stop density doesn't allow for speeds higher than 90 for more than short, schedule-insignificant lengths...wasting the Acelas' primary advantage amidst too many unacceptable downsides. Acceleration to lower speed isn't lights-out better than a Sprinter loco segregated to only the 93 MPH-rated bi-level coaches in the T fleet, because the sets are so heavy for their limited capacity and the power cars an aging, problematic design. And for comparison, EMU's wouldn't be ordered rated higher than 90-100 MPH because the excess isn't worth the extra cost/weight/electric demand (though 125 MPH commuter makes are factory-orderable, they're rarely maintained over life at >100).
The only halfway-officially confirmed repurposement of the Acelas, mentioned by AMTK shop employees on RR.net, was retaining 1 set as a high-speed work train and a couple extra carriages and power cars as parts sources for the test set. And that proposal seems to have gone by the boards because the Bombardier contract would still have its teeth in them. Talk of sticking them on the Keystones or as NEC supplementals has never gone further than railfan foamer acid dreams. The Keystone Line tops out at 125 MPH...so another case of lacking the one upside that counteracts a pile of vehicular downsides.
They'll be placed in dead storage until the Bombardier contract hits repossession-by-inactivity clauses. Then they're BBD's problem, but by that point parts scarcity will have gotten so acute that re-use anywhere in the world is out of the question. Blame it on that awful contract if you wanted to see them continue, but the vehicles bleed so much maint money per every hour of service duty that in dollars-and-sense you never practically would've wanted to do that in the first place.