New York and Washington, D.C. share the Northeast Corridor, with Philadelphia and Baltimore on the same line. Under 3 hours on the fastest Acela, no airport.
Atlanta is the outlier. It is not on I-95. South of D.C., I-85 leaves I-95 at Petersburg, Virginia and runs through Durham, Charlotte and Greenville to Atlanta. Nonstop flights link Atlanta with D.C. and New York if you would rather not drive.
One train stops in all three training cities: Amtrak's Crescent, one departure a day each way, overnight with sleeper cars, New York to Atlanta by way of Philadelphia, Baltimore, Washington, D.C. and Charlotte.
What Each Month Looks Like
Atlanta in March 2027: tree pollen peaks in late March, and the yellow dust on the cars is mostly pine. Pack allergy medicine.
Washington, D.C. in May 2027: the azaleas at the National Arboretum often peak in early May. Pack for a few rainy days.
New York in October 2027: cooler nights, and Hudson Valley foliage usually peaks around mid-October if you want to add a day.