The
Northeast Corridor (
NEC) is an electrified
railway line in the
Northeast megalopolis of the United States. Owned primarily by
Amtrak, it runs from
Boston through
New York City,
Philadelphia, and
Baltimore to
Washington, D.C.. The NEC closely parallels
Interstate 95 for most of its length, and is the busiest passenger rail line in the United States by ridership and service frequency as of 2013. Branches to
Harrisburg, Pennsylvania, and
Springfield, Massachusetts, though not considered part of the Northeast Corridor, see frequent service from routes that run largely on the corridor.