Supposed to replace the current consists (do we even use those things?) by 2021.
http://www.msn.com/en-us/travel/news/amtrak-unveils-new-acela-trains/ar-AAieQ5r?OCID=ansmsnnews11
http://www.msn.com/en-us/travel/news/amtrak-unveils-new-acela-trains/ar-AAieQ5r?OCID=ansmsnnews11