which Amtrak's flagship service along the Northeast Corridor is  currently the only services in the country
High-speed rail in the United States:  The Acela Express (reaching 150 mph) and the Northeast Regional (reaching 125 mph) are currently the only services in the country (the Metroliner was discontinued in 2006). Acela Express: The Acela Express ( ; colloquially abbreviated to Acela) is Amtrak's flagship service along the Northeast Corridor (NEC) in the Northeast United States between Washington, D.C. and Boston via 14 intermediate stops including Baltimore, Philadelphia, and New York City.
Acela Express