The agency says the track condition was in Secaucus, but offered no details.
Amtrak and NJ Transit trains were using a single track between the city and Newark, New Jersey.
Rail tickets and passes were cross-honored by NJ Transit bus, private carriers and PATH at Newark Penn Station, Hoboken Terminal and 33rd Street New York.
NJT urged customers to visit their website for available alternative service information.
This is breaking news. This story will be updated as more information becomes available.
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