NJ Transit says Amtrak overhead wire issues originated in one of the Hudson River tunnels.
Service was suspended for a time, but has since resumed with delays.
NJ Transit rail service into and out of New York Penn Station is subject to 30-minute delays.
Midtown Direct trains are no longer being diverted to Hoboken.
Meanwhile, Amtrak says all trains traveling between New York and Philadelphia will also experience delays.
Monday evening's issues come after week-long delays and cancellations for NJ Transit and Amtrak last week.
NJ Transit and CEO Kevin Corbett released a statement Friday afternoon, and called the issues "unacceptable."
But perhaps a piece of good news to emerge from the difficult transportation week in the Garden State, New Jersey has a tentative agreement in place with the state's most profitable companies to temporarily pay higher taxes to fund NJ Transit.
Under the plan, the 600 corporations in the state that make at least $10 million a year in profits will pay a 2.5% tax on all earnings for five years.
In return, the state will not pursue restoring the sales tax to 7% from to 6.625%, a major point of contention for the businesses, who strongly oppose increasing the corporate tax rate.
Both the "transit tax" and a final state budget still need to be approved by the Legislature next week. The budget expires June 30.
----------
* Get Eyewitness News Delivered
* More New Jersey news
* Send us a news tip
* Download the abc7NY app for breaking news alerts
* Follow us on YouTube