Baltimore & Potomac Tunnel: 2026 Construction Update
Baltimore’s aging B&P Tunnel gets a $4B upgrade! A new, high-capacity Frederick Douglass Tunnel will boost rail efficiency and create thousands of jobs.

Frederick Douglass Tunnel: B&P Tunnel Replacement Project Profile
The Frederick Douglass Tunnel Program is a transformative infrastructure initiative designed to replace the 150-year-old Baltimore & Potomac (B&P) Tunnel on the Northeast Corridor (NEC). This project resolves a critical bottleneck by constructing two new high-capacity, single-track tubes for electrified passenger rail, increasing speeds more than threefold and significantly enhancing service reliability for Amtrak and MARC commuter operations. The program represents a comprehensive upgrade to regional rail infrastructure, encompassing new signaling systems, station construction, and extensive community investment.
| Attribute | Details |
|---|---|
| Project Name | Frederick Douglass Tunnel Program (B&P Tunnel Replacement) |
| Location | Baltimore, Maryland, USA (Northeast Corridor) |
| Tunnel Length | Approximately 6.4 km (4 miles) of new tunnel alignment |
| Max Operational Speed | 177 km/h (110 mph), increased from 48 km/h (30 mph) |
| Estimated Cost | Up to $6 billion |
| Project Status (Nov 2025) | Under Construction |
| Key Contractors & Partners | Amtrak, Maryland Department of Transportation (MDOT), Kiewit/J.F. Shea Joint Venture (Construction), HNTB, RK&K |
Technical Specifications
The core of the project is the construction of two parallel, single-track tunnel bores dedicated to passenger rail. This design eliminates the operational constraints of the existing two-track tunnel, which forces Amtrak and MARC trains into a single chokepoint. The new alignment will feature modern electrification and advanced signaling systems, including Positive Train Control (PTC), enabling high-speed operations. Construction methodologies are tailored for a dense urban environment, requiring precise tunneling techniques to navigate beneath existing city infrastructure while minimizing surface disruption. The project also includes the demolition and replacement of multiple roadway and railway bridges, construction of a new ADA-compliant West Baltimore MARC Station, and the installation of modern fire and life safety systems, including emergency ventilation and egress pathways within the new tunnel structure.
Key Takeaways
- Bottleneck Elimination: Replaces the single largest rail chokepoint between Washington, D.C., and New York City, projected to reduce daily delays by seven hours on weekdays and improve on-time performance for millions of annual passengers.
- Capacity and Speed Enhancement: The new infrastructure will allow for a dramatic increase in train speeds from 30 mph to over 100 mph, reducing travel times and enabling future service expansion for both Amtrak and MARC.
- Economic and Community Modernization: The project is a significant economic catalyst, projected to create 30,000 jobs. It is coupled with a substantial community benefits program, investing over $50 million in local workforce development, neighborhood improvements, and non-profit support.
Frequently Asked Questions (FAQ)
When will the Frederick Douglass Tunnel open?
The Frederick Douglass Tunnel is being built in phases. Major construction began in 2023, and passenger rail service is expected to begin operating through the new tunnel in the early 2030s, with the full program projected for completion by 2035.
Who is building the Frederick Douglass Tunnel?
Amtrak is leading the development and construction of the Frederick Douglass Tunnel in partnership with the Maryland Department of Transportation (MDOT) and the Federal Railroad Administration (FRA). The primary construction contract for the southern approach was awarded to the Kiewit/J.F. Shea Joint Venture, with numerous engineering and consulting firms like HNTB and RK&K providing design and project management services.

