Buses will replace four trains in each direction Saturday between 1:03 a.m. and 7:35 a.m. from Great Neck to Port Washington as the Long Island Rail Road does track testing, the railroad said.

Eastbound riders can board buses or vans at Great Neck for stops at Manhasset through Port Washington. Allow for up to 27 minutes of additional travel time, the railroad said.

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Westbound riders from Port Washington through Manhasset can board a bus or van bound for Great Neck, where they can connect for train service to points west. Allow up to 31 minutes of additional travel time, the railroad said.

Bus and train schedules for the eight affected trains are available at http://web.mta.info/lirr/Timetable/.