Long Island Rail Road customers are urged to allow extra travel time and plan alternate routes Sunday because of track work in Westbury.
The work at the new Ellison Avenue Bridge there began Saturday and is expected to disrupt travel for up to 40,000 customers, the Long Island Rail Road said.
The suspension affects riders on the Port Jefferson and Ronkonkoma branches the most, as replacement buses will lengthen travel times by up to an hour.
The LIRR is installing a new bridge at Ellison Avenue to replace the aging one that was demolished in May.
Buses are replacing trains between the Hicksville and Mineola stations for the 48 hours.
From 7 a.m. to midnight, Ronkonkoma branch trains for stations from Farmingdale to Ronkonkoma will be diverted to the Babylon and Central branches for service.
"We strongly urge our customers to avoid the Ronkonkoma and Port Jefferson branches" during the construction, said LIRR president Patrick Nowakowski. "We regret the inconvenience, but for safety reasons, the installation of the new bridge requires a complete suspension of train service between Hicksville and Mineola."
Special weekend timetables are at nwsdy.li/ellisonschedule; more information is at nwsdy.li/ellisoninfo.