However, Northeast Corridor, North Jersey Coast Line, Raritan Valley Line and Midtown direct service may experience scattered 10-15 minute delays during the evening's peak period.
"It was done as a precautionary measure. None of the trains lost power," said Cliff Cole, a spokesman for Amtrak, which operates the tracks used by both agencies.
The source of the problem was not immediately located, he said.
The agencies had no immediate figures on the number of trains or passengers affected.
The problem put all trains on the Northeast Corridor, Midtown Direct and North Jersey Coast lines up to 90 minutes behind schedule.
PATH is cross-honoring tickets for passengers boarding at Newark Penn Station and Hoboken Terminal.
Voltage dropped to about 9,000 volts, from a normal reading of about 12,000, at about 12:20 p.m., Cole said. Power was restored about 1:50 p.m., he said.
A few Amtrak trains that were in tunnels were moved to stations, Cole said. NJ Transit spokesman Dan Stessel said its trains were moved to stations and held there.
The Southeastern Pennsylvania Transportation Authority said its train line between Philadelphia and Trenton was affected.
Customers are encouraged to check www.njtransit.com for the latest information before starting their trip.
