The Long Beach branch was on or close to schedule Tuesday afternoon after delays during the morning rush caused by a fallen utility pole near Oceanside, the LIRR said.
The Long Island Rail Road had reported delays of 10 to 15 minutes in both directions on the branch as trains slowed because of the pole.
As of about 10:30 a.m. service was operating with intermittent delays, a spokesman said.
Earlier, the 7:54 a.m. train from Deer Park, due in Riverhead at 8:55 a.m., originated from Ronkonkoma, the railroad said. Buses were provided for riders Deer Park, Brentwood and Central Islip, the railroad said.