Y42CN01 DB RFLOI Red Line Hi‑Rail Access Tunnel

The MBTA is seeking Letters of Interest (LOI) from qualified design‑build entities to provide design‑build services for a new access tunnel to the Red Line in Cambridge, MA. The project involves designing and constructing a 15‑ft wide access road, a boat‑section ramp, and a new tunnel segment to improve equipment and material delivery to the existing subway tunnel. The scope includes excavation with sheet‑piling, dewatering, concrete tunnel construction, flood‑door installation, and related electrical and security work. The contract is estimated at $42 million and will be awarded through a two‑phase best‑value DB procurement (RFQ → RFP). • Design‑build of a 150‑ft access road, 130‑ft boat‑section ramp, and new tunnel connection to the Red Line. • Full civil‑engineering, structural, mechanical, electrical, and environmental scope (sheet‑pile walls, dewatering, contaminated‑soil remediation, flood door, lighting, security). • Project funding is non‑federal; estimated contract value $42 M; construction duration 30 months after notice to proceed (NTP) with start anticipated April 2027.