Distance between Washington DC and New York by train?

Answer 1

Depends on the Amtrak train:

Northeast Regional trains average about 4 hours (=/-)

Acela Express trains average about 3 hours (=/-)

(I checked the Amtrak Northeast Corridor timetable)

Answer 2

From New York City to Washington DC it will take you 3-3 and a half hours.

From New York City to Seattle, Washington it will take you about 65 hours with two connections.

Answer 3

The Distance between Washington DC and New York is about 238 miles. The fastest train would take about 3 and half hours to reach New York from Washington with about 4 intermediate stops.