Trains were briefly held on the Ronkonkoma, Port Jefferson and Oyster Bay Branches while crews worked on fixing the signals.
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All trains on these branches made all local stops between Hicksville and Floral Park, as well as Jamaica.
As an alternative, NYC Transit was cross-honoring LIRR tickets on the E/J/Z at Jamaica Station.
LIRR officials say PSEG was on the scene troubleshooting the power issue, which was affecting the signals.
The signal problems may be residual from a fire at a power substation in New Hyde Park that may have been caused by lightning.
The LIRR had previously said the service was restored from Tuesday night's disruptions.
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