The Ronkonkoma Branch is one of the Long Island Rail Road’s fastest-growing lines, serving thousands of commuters traveling between New York City and Suffolk County. Prior to construction of the second track, the 18‑mile corridor faced capacity limits and recurring reliability challenges that constrained service and hindered economic development. The New Main Line Second Track project delivered a transformative upgrade that expanded operational flexibility and improved travel time dependability for riders throughout Long Island.
What challenges did STV address?
The corridor’s single‑track configuration created a significant bottleneck that restricted train frequency and prevented reverse peak service. Any disruption along the route had the potential to halt service entirely. The project required a comprehensive redesign of track infrastructure, stations and supporting systems while maintaining service continuity for tens of thousands of daily riders.
What solutions did STV deliver?
In joint venture, STV provided project management, environmental planning and design services for the $300 million program. The team designed track alignment, grading, drainage, retaining walls, pedestrian tunnels and station improvements at two locations. STV also led the design of utilities, traction power, communications, signals, interlockings and a pedestrian bridge, ensuring the corridor could accommodate expanded and more reliable service.
How does this project benefit the region?
The second track supports four additional off‑peak trains at half‑hour intervals and provides reverse peak service from Ronkonkoma for the first time. The added capacity enhances reliability by allowing dispatchers to route trains around disabled equipment rather than shutting down the line, strengthening mobility for commuters and supporting economic growth across Long Island.
Key Stats and Accolades
- 18‑mile capacity expansion
- Four additional off‑peak trains
- First‑ever reverse peak service from Ronkonkoma
