Updated at 3:23 p.m.

Amtrak said Wednesday afternoon that it had not made a decision about service for Thursday along the Northeast Corridor and warned that service levels of trains running along that route could be impacted for the rest of the week.

Early Wednesday, Amtrak had made several changes to its service in the Northeast Corridor after the train derailment in Philadelphia that left seven people dead.

Highlights:

*Amtrak will offer modified service between Washington and Philadelphia.
*No Amtrak service between New York and Philadelphia.
*Service will also be modified between New York and Boston and between Harrisburg and Philadelphia.
*New Jersey Transit will honor Amtrak tickets between New York City and Trenton.

The Northeast Regional Train 188, traveling between D.C. and New York, derailed Tuesday night around 9:30 p.m. At least six people are dead and 140 have been hospitalized. The train service said about 238 people and five crew members were on board.

[6 dead after Amtrak train from D.C. derails in Philadelphia]

Amtrak riders should check the train service’s Web site for updates, as it is expected to make changes throughout the day and possibly throughout the week while authorities deal with the wreckage. The train service also encouraged riders to check its blog for updates on changes to schedules and warned that conditions could change.

In a statement, Amtrak said it “regrets any inconvenience” and expressed its sympathies for those who were killed or injured in the crash.

Transportation officials said they expect other modes, including buses and airplanes, between D.C. and New York to be swarmed by riders trying to make changes to their schedules for Wednesday and the rest of the week.

Early Wednesday morning, the Amtrak’s 1-800 number (800-USA-RAIL) for checking on train service had long waits.

An Amtrak official said decisions are expected to be made later on Wednesday as to how service will run along the Northeast Corridor  for the rest of the week.

On Wednesday morning, some passengers were trying to make alternate arrangements to get from D.C. to cities along the Northeast Corridor.

Jeffrey Goldfarb was about to board a 7:25 a.m. train at Union Station to New York City when an Amtrak employee announced that all trains traveling north of Philadelphia were canceled.

“We’ll get you to Philly and then you’re on your own,” the employee said.

“I guess I’ll call my clients and tell them I’m not coming,” said Goldfarb, who works at a public relations firm and frequently takes the train to New York.

He said he still feels trains are a safe mode of traveling, and this crash doesn’t change that for him.

“I feel it’s probably a rare occurrence,” he said.

Another Amtrak rider — Kate McSweeny — said she had planned to travel from D.C. where she works as a lawyer to New York on Wednesday but decided to cancel her trip after the derailment. When she checked early Wednesday morning on the status of her 5:30 a.m. train from Union Station in the District to New York, it read “status unavailable.” And she considered flying on a shuttle on either Delta or US Airways but a ticket was averaging about $1,300 roundtrip.

“I was going to a meeting and was really looking forward to it,” said McSweeny, who takes the train from D.C. to the northeast area several times a month. “I really feel for those people on the train.”