Phase I of this Design-Build project has enabled the LIRR to install a second track through the first segment of a largely single tracked, 19.9 mile corridor between Farmingdale and Ronkonkoma in Suffolk County, New York.
The construction of a second track eliminates current LIRR operational limitations and increases service reliability and on-time performance along the main line. The Skanska-Posillico Design-Build Team performed all work within the right of way, including clearing and grubbing, excavation and backfill, construction of infiltration trenches, construction of retaining walls to support the future second track (cut walls and fill walls), placing of subgrade and subballast, installation of fences, rebuilding four crossings, relocation of an existing pedestrian bridge and wetland mitigation at the adjacent park.
The Skanska/Posillico Design-Build Team was awarded Phase II of this project in June 2016 and estimates completion in November of this year.
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2017 ASCE LI Design-Build Award
