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MTA Long Island Rail Road (LIRR) last week replaced switches and inspected track between Farmingdale and Ronkonkoma, New York, as part of a double-track project.To complete the inspection, crews used a diagnostic car fitted with ultrasonic and induction test equipment. The equipment is designed to detect and repair internal rail defects that aren't easily visible, LIRR officials said in a press release. Maintenance crews followed the inspection train to conduct repairs as needed. LIRR is adding a second track along a 13-mile stretch between Farmingdale and Ronkonkoma. The additional track will enable the railroad to provide more frequent off-peak service in both directions and increase operational flexibility in the event of service disruptions, according to the LIRR.The double-track project is targeted for completion by 2018's end.RailWorks Corp. subsidiary L.K. Comstock & Co. Inc. was previously awarded a $66.5 million contract to perform track and systems installation for the project.