Service on the NJ Transit Raritan Valley line was restored Wednesday after a suspension between Cranford and Newark Penn Station.
An overhead wire problem was the cause for the disruption.
The first train back in service on RVL, was the #5408.
Buses were being provided. NJ Transit says it will cross-honor rail passes and tickets.
NJ Transit rail customers should anticipate delays.
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Riders should anticipate some changes but "near normal" service on the Long Island Rail Road for the morning rush. Crews have been working to repair tracks and switches after Monday's derailment.