Passengers had faced delays of up to two hours Wednesday after a fallen tree knocked out power and rail signals.
Amtrak spokesman Cliff Cole says the tree took down overhead power wires near Hamilton, N.J., around 5:30 a.m., causing delays between New York City and Philadelphia. Amtrak trains were able to move again by 8 a.m. but at greatly reduced speeds.
By 4 p.m., there were residual delays of 15 to 30 minutes.
NJ Transit says its Northeast Corridor commuter trains are running 15 to 20 minutes behind schedule and some trains might be canceled or combined for the evening commute.