At least two westbound trains reported significant delays before 7 a.m. because of signal issues west of Ronkonkoma station, the commuter service said.
The 6:56 a.m. train from Ronkonkoma due at the Atlantic Terminal at 8:17 a.m. was delayed 24 minutes.
The rail service reported at 7:43 a.m. in an alert to customers that trains departing Ronkonkoma were on or close to schedule. There were "residual delays of 20-25 minutes for westbound service" because of the previous signal trouble, the email alert said.
The 5:30 a.m. train from Greenport due in Ronkonkoma at 6:53 a.m. was 21 minutes late because of congestion caused by signal trouble, the LIRR said.
Two other westbound trains scheduled to leave Ronkonkoma for Penn Station around 7 a.m. also reported delays.