It's not clear whether hundreds of rail riders will face delays throughout the afternoon along Amtrak's busy Northeast Corridor.
Amtrak spokesman Cliff Cole says a tree fell on overhead wires near Hamilton, N.J., around 5:30 a.m. Wednesday
Trains are moving at greatly reduced speeds between New York City and Philadelphia while repairs continue.
Cole says Amtrak passengers should expect delays of 90 minutes to 2 hours on southbound trains and from 60 to 90 minutes on northbound trains.
NJ Transit resumed service between Trenton and the Jersey Avenue station in New Brunswick at 10:50 a.m. with delays of 30 to 45 minutes in and out of New York.