Amtrak trains are once again running in and out of Philadelphia for the first time since last week's deadly derailment.

FOX News Radio's Tonya J. Powers has more:

Around three dozen people were on board the train out of Philadelphia early this morning -- with Mayor Michael Nutter there to see them off.

At New York's Penn Station, this man says he's not worried.

(Passenger) "Not at all actually... because with the added attention, I think this is going to be a very smooth ride."

Regional commuter service has also resumed.

Federal regulators have ordered Amtrak to expand a speed-control system in the crash area.

Amtrak President Joseph Boardman took part in a service at the crash site Sunday night to honor the eight who died.

About 20 of those hurt in the crash remain in Philadelphia hospitals.

In New York City, Tonya J. Powers, FOX News Radio.