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)
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.
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.
203.99 miles
The distance from New York State to Washington State is around 2900 miles.
stop
It is 204 miles from Washington D.C to New York, 328 kilometers from Washington to New York.
Train, bus and plane.
approx. 230 miles
Stamford is approximately 50 minutes from New York City via train.
Acela Express. It operates between Boston, New York, and Washington.
The driving distance is 226 miles, which takes about 4 and a half hours.
230 miles
The total distance between Washington D.C and New York is 425 miles. It takes anything between 7 hours to 7 hours and 15 minutes to drive from New York to Washington D.C.
The driving distance from Washington to New York is an estimated 3 hours and 44 minutes. There are 225.90 miles between the two places.