As a subconsultant, SI Engineering, P.C. (SIE) provided project management and construction management for the Long Island Rail Road Mainline Third Track Design-Build Project. The project consisted of approximately 9.8 miles of additional track infrastructure, including a new 3rd track and associated systems (signals, power, and communications), grade crossing modifications (separations / closures), modification of existing or newly constructed line structures (bridges), station and parking improvements, utility relocations, drainage improvements, substation replacements, as well as other improvements along the Main Line between Floral Park (Bellerose Interlocking) and Hicksville Station (the Divide Interlocking) in Nassau County.
The project included the elimination of the seven (7) grade crossings along this route, upgrades to railroad infrastructure and stations, and new parking facilities. This reduced train congestion and delays, and enabled true bi-directional service during peak hours, as well as more intra-Island service. Unlike previous attempts to build a third track on the Main Line, this time, the track was built within the existing LIRR right-of-way. Construction was handled in a way to minimize the impact on daily routines, with extensive mitigation efforts planned in conjunction with local communities.
The end result is a Long Island with better rail service, safer, less-congested roads, cleaner air, quieter backyards and neighborhoods, and a public transit infrastructure better equipped to serve the job and population growth our region needs to prosper.
