Superstorm Sandy has weakened, yet her presence will be felt in the days and weeks to come as transportation systems assess impacts and try to resume schedules.
Much of Tuesday's air and rail service has been canceled, and millions of public transit commuters are without service. Here's what to expect in many of the affected areas:
New York City's massive public transit network was crippled overnight.
"The New York City subway system is 108 years old, but it has never faced a disaster as devastating as what we experienced last night," MTA Chairman Joseph J. Lhoto said in an online statement.
Seven subway tunnels under the East River flooded in the course of the storm, the Metro-North Railroad lost power in sections of its lines and the Long Island Rail Road sustained flooding in one East River tunnel and evacuated its West Side Yards, according to the statement. The Hugh L. Carey Tunnel flooded "from end to end," the Queens Midtown Tunnel also was closed because of flooding, and six bus garages were disabled.
Lhota said MTA employees will restore service as quickly as possible "to help bring New York back to normal."
In New Jersey, all NJ Transit services remain suspended until further notice. Transit service is also suspended Tuesday in Maryland, according to the Maryland Transit Administration.
Transit officials in Philadelphia said they are optimistic that city and suburban services will be up and running sometime Tuesday but could not give an exact time.
Southeastern Pennsylvania's regional rail commuter lines present a bigger challenge, said SEPTA spokeswoman Jerri Williams. Crews were out overnight and were walking the lines Tuesday assessing damage with the hopes of resuming commuter rail service Wednesday morning.