CSX Launches $496M Double-Stack Service in Baltimore

Baltimore, Maryland, USA – CSX and state officials on June 18, 2026, celebrated the start of double-stack rail service through the historic Howard Street Tunnel, capping a $496 million, multiyear infrastructure upgrade. The project increased vertical clearance by lowering the tunnel’s track 18 inches and made similar adjustments at 21 other clearance points in Maryland, Delaware and Pennsylvania. CSX reopened the tunnel in September 2025, finishing the work ahead of schedule.

What Is the Full Scope of This Project?

The Howard Street Tunnel double-stack clearance initiative is a $496 million public-private effort that modified 22 clearance points along CSX’s freight corridor from the Port of Baltimore to the Midwest. The 131-year-old tunnel, which opened in 1895, was the most constrained point; in addition to the 18-inch track lowering inside the tunnel, crews raised or recontoured 21 bridges and overhead structures in three states. The completed route now allows double-stacked container trains to move directly from Baltimore’s marine terminals to Chicago and other inland markets without height restrictions, bypassing trucking bottlenecks on the Interstate 95 corridor. The financing involved CSX, the Maryland Department of Transportation, the Maryland Port Administration, and federal partners, but the exact public-private funding split was not disclosed.

Key Project Data

How Does This Compare to Similar Projects?

At $496 million, the Howard Street Tunnel project falls between two major East Coast double-stack clearance programs: Norfolk Southern’s Heartland Corridor, a $320 million initiative completed in 2010 that raised clearances in 28 tunnels between Virginia and Ohio, and CSX’s own National Gateway, a $850 million multi-state program finished in 2013 that enabled double-stack service from Mid-Atlantic ports to the Midwest (Source: CSX, 2013). Whereas those efforts spanned hundreds of route-miles across multiple tunnels, the Howard Street project concentrated investment on a single 131-year-old urban tunnel and surrounding pinch points, resulting in a significantly higher cost per clearance location due to dense-city construction conditions and the need to simultaneously rehabilitate century-old rail infrastructure. The timing aligns with a documented shift by shippers back to rail intermodal as trucking rates rise and fuel prices remain high, a trend highlighted in a June 2026 logistics report (Source: Wall Street Journal, 2026).

Editor’s Analysis

The Howard Street clearance removes a long-standing competitive disadvantage for the Port of Baltimore against East Coast rivals like Norfolk and Savannah that already offered double-stack rail access to the interior. By enabling direct, high-capacity train departures, the port can now capture growing intermodal volumes driven by trucking labor constraints and shippers seeking slower but cheaper transit—tailwinds that are redrawing U.S. chemical and consumer-goods supply chains. With logistics provider consolidation intensifying and rail carriers under pressure to maintain service levels, this fixed-capacity expansion will likely strengthen Baltimore’s position as a Midwestern gateway for decades.

FAQ

Q: What is the new height clearance inside the Howard Street Tunnel?
A: CSX did not publicly disclose the final clearance measurement after the project. The 18-inch track lowering is sufficient to permit double-stack container trains to pass without restrictions, meeting standard Plate H intermodal clearances used across the CSX network.

Q: When was the Howard Street Tunnel originally built and when did it first reopen after work?
A: The tunnel opened in 1895. CSX reopened it in September 2025 after completing clearance expansion work ahead of schedule; revenue double-stack service began in June 2026.

Q: How will this project affect truck traffic and emissions?
A: Officials expect the shift of containers from road to rail to reduce congestion on the I-95 corridor and lower overall freight emissions. However, specific expected annual truck-trip reductions or carbon savings were not released by the project partners.