Modified Amtrak service south from New York City was scheduled to resume Thursday night, half a day earlier than planned.
However, Amtrak cautions riders that they could still face delays to and from New York due to continuing repairs.
Workers were "continuing to remove water from tunnels in order to make repairs to track, signal and power systems under the Hudson and East rivers and to restore service to and from Penn Station in New York City," Amtrak's website said Thursday morning.
Plans to resume Northeast Regional service between New York and Boston, as well as modified Acela Express service, will be announced "later," Amtrak said.
Limited service on south of New York City had resumed Wednesday, and service from Boston to New Haven, Conn., resumed early Thursday.
Locally, Metro got back to business as usual Wednesday, after closing completely Monday, and opening late and running on a light schedule Tuesday.
MetroAccess service also resumed Wednesday.
The return of Metro is a relief in the D.C. area, especially immediately after the storm, when many roads were still closed due to downed trees and residual flooding.
Washington, D.C., Maryland and Virginia local news, events and information
More than 100 roads in Fairfax, Loudoun and Prince William counties had been blocked by trees or water immediately after the storm, the Virginia Department of Transportation reported.
The Maryland State Highway Administration also had reported about 100 dark intersections around the state before things got back to normal.
Although all three major local airport had continued to halt airline operations through Tuesday morning, a very limited number of flights were arriving and departing by the evening.
Schedules resumed for many flights Wednesday, and by Thursday, schedules were back to normal with the exception of those to and from the New York area.