Amtrak and NJ Transit say delays that snarled rush-hour commutes through New York's Pennsylvania Station are beginning to ease.
Amtrak spokesman Cliff Cole says wire problems in a tube beneath the Hudson River started around 6 a.m. and caused delays up to 90 minutes.
The tube reopened at 9:10 a.m. but residual delays continued.
Amtrak's problems also affected service on NJ Transit, which uses some of the same tracks.
NJ Transit spokesman Dan Stessel says delays of 30 to 60 minutes could continue throughout Thursday morning. Afternoon and evening service should be OK.
Amtrak operates trains to and from New Jersey, Washington D.C., Connecticut and Massachusetts.