In the first phase of the work, from May 14 through June 22, midday busing will replace trains between Brentwood and Ronkonkoma stations. Six eastbound and six westbound trains will originate and terminate at Brentwood station.

The second phase of the work, from June 25 through July 20, requires the use of single track between Deer Park and Brentwood during the midday.

In the final phase, between July 23 and August 10, buses will replace midday train service between Hicksville and Ronkonkoma. All Ronkonkoma Branch midday trains will terminate and originate at Farmingdale.