The threat of a Long Island Rail Road strike is hanging over nearly 300,000 daily riders and could start as soon as Saturday.

Starting Monday, the LIRR will roll out planned timetable changes that adjust pre‑dawn and late‑evening service on several branches. The tweaks hit early‑morning stops on the Ronkonkoma and Port Jefferson lines and trim some late‑night Brooklyn trips,

On the Ronkonkoma and Port Jefferson branches, there will be a new weekday train leaving Farmingdale at 4:32 a.m., with stops at Bethpage, Hicksville, Westbury, Mineola, New Hyde Park and Jamaica, before arriving at Penn Station at 5:26 a.m.

As LIRR union representatives and the MTA race against a Saturday deadline to reach an agreement, the MTA has released a contingency plan for a possible strike.

The Long Island Rail Road's planned schedule adjustments are set to go into effect Monday, less than a week away from possible union strikes. These adjustments were preplanned and will not affect rush hour service, according to the LIRR. The changes affect ...

The Long Island Rail Road will begin summer service schedules on May 18 on the Montauk, Long Beach and Ronkonkoma lines — including more weekday trains to Montauk.