The Ronkonkoma Branch is a rail service operated by the Long Island Rail Road (LIRR) in the U.S. state of New York. On LIRR maps and printed schedules, the "Ronkonkoma Branch" includes trains running along the railroad's Main Line from Hicksville (where the Port Jefferson Branch leaves the Main Line) to Ronkonkoma, and between Ronkonkoma and the Main Line's eastern terminus at Greenport. The section of the Main Line east of Ronkonkoma is not electrified and is referred to as the Greenport Branch. The western segment between Hicksville and Ronkonkoma sees 24-hour service to Penn Station in New York City. The eastern segment between Ronkonkoma and Greenport is served by diesel-electric trains, and only sees a handful of trips each day. The eastern segment is also the only dark territory area of the Long Island Rail Road, meaning that it does not have signals. Segments Hicksville to Ronkonkoma The western segment of the line from Hicksville to Ronkonkoma was electrified in 1987, creating a one-seat ride to Penn Station. Formerly, service on this segment was provided by diesel trains, which could not enter Penn Station, requiring a transfer. Average rush-hour trip time from Ronkonkoma to Penn Station decreased from 97 minutes pre-electrification (including the mandatory transfer from a diesel to an electric train) to 71 minutes afterwards. The $168.5 million project attracted many new passengers. A survey of peak-hour Ronkonkoma Branch passengers conducted by the LIRR in April 1988 found that 42 percent of the branch's passengers were new to the line: 34 percent switched from other lines (the Port Jefferson and Montauk Branches), 6 percent were new to the LIRR as a whole and 2 percent recently returned to the LIRR. By September 1988, over 2,000 new riders during the morning rush hour had switched to the Ronkonkoma Branch, much of which occurred in the first month after electrification, faster than the LIRR expected. Commuters complained that the expanded parking facilities at Ronkonkoma built in anticipation of electrification were overcrowded and already inadequate, and that double-parking and vandalism were rampant. In the decades since, the amount of parking at Ronkonkoma has expanded. In 2012, the Metropolitan Transportation Authority (MTA) started adding a second track to the line between Farmingdale and Ronkonkoma to increase capacity. The project was ultimately completed in 2018. Greenport Branch The between and , known as the Greenport Branch, is the only remaining dark territory area