Amtrak Restarts Northeast Corridor Service amid Probe

Amtrak trains are moving along the Northeast Corridor again for the first time since last Tuesday's derailment in Philadelphia that killed eight people and injured 200 others.

"It's great to be back," Christian Milton, in Philadelphia, said. "I've never had any real problems with Amtrak. I've been traveling it for over 10 years. There's one accident in 10 years. Something invariably is going to happen somewhere along the lines. I'm not worried about it."

"My biggest takeaway was the under-promise and over-deliver and the surprise of having it come back this morning when that wasn't expected," Tom Carberry, from Philadelphia, said.

"That was a good thing for Amtrak," he added.

Investigators are still trying to determine why the train was traveling at more than twice the speed limit.

They're also looking into reports that the train was hit by unknown objects, such as rocks or even bullets. Other trains reported being hit by objects near the place and time of the train derailment.

Over the weekend, Amtrak installed new speed controls at the section of the track where the crash happened.

Meanwhile, Amtrak could be forced to pay $200 million to victims of the deadly derailment, but that's all.

Congress set that amount as the payout limit for Amtrak as part of legislative action in 1997 designed to protect Amtrak from financial ruin from costly lawsuits.