Possible Clues:

• Boston-to-D.C. rail service
• Fast train to Boston
• It reaches speeds of 150 miles per hour
• Train that serves three Union Stations
• Train that stops in New Haven and New York
• Washington-to-Boston speeder
• Boston-to-Washington option
• ___ corridor, Northeast transportation route
• ___ Express (fastest train in North America)
• East Coast Amtrak service with the fastest trains in the Americas