Commuters on the Montauk branch of the Long Island Rail Road will be using buses Thursday for a part of their off-peak travel because of rail inspections, the rail service said.

The final day of a four-day series of rail inspections on the Montauk branch will be finished Thursday, between 9:15 a.m. and noon, according to the LIRR. Thursday's inspections using a Sperry rail car will be between Babylon and Patchogue.

Customers should allow for up to 90 minutes additional travel time Thursday, depending on destination, the LIRR said.

Here are details about Thursday's altered schedule, between Babylon and Patchogue:

Eastbound: Customers traveling to Bay Shore, Islip, Great River, Oakdale, Sayville, Patchogue, Bellport, Mastic-Shirley and Speonk will go by train to Babylon, where buses will take them to their final destinations. Up to 23 minutes additional travel time is to be expected.

Westbound: Customers who usually board trains at Patchogue, Sayville, Oakdale, Great River, Islip and Bay Shore will instead take buses to Babylon, where train service will resume. Buses will depart up to 12 minutes later than usual train departure times and arrive at their destinations up to 40 minutes later.

Additional information is available in special Babylon and Montauk branch timetables or by calling 511, the New York State Travel Information Line (say, Long Island Rail Road). Customers can also go to mta.info/lirr.

The Sperry car uses ultrasonic and induction test equipment designed to find internal rail defects not readily visible to the eye, the service said. Inspections on the branch began Monday.

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