The dream of riding a single train between Boston’s North Station and South Station is now 112 years old—and it’s still stuck on paper. The North South Rail Link remains one of Bostonians’ most requested MBTA projects, but its multibillion-dollar price tag and competing transit priorities keep slowing it down.
What is the North-South Rail Link?
The North South Rail Link is a proposed underground tunnel that would connect North Station and South Station and tie together Boston’s commuter rail lines. Instead of forcing riders to change trains, hop on the subway, or walk between stations, trains could run straight through the city.
North Station opened in 1893 and once ranked among the busiest terminals in the country. South Station followed in 1900 with 28 tracks—far more than it uses today. Even though they sit just over a mile apart, they’ve never shared a direct rail connection.
Why the link matters
That short gap creates a much bigger problem for riders from the North Shore, South Shore, Central Mass., the Cape, and beyond. Trains from the north can’t continue to the south, and vice versa, so trips that should feel seamless often involve transfers, delays, and a lot of hassle.
Many commuters look at that reality and decide to drive instead, which only adds to Boston’s already packed highways. A through-running link could cut travel times, make regional trips easier, and give more people a reason to leave their cars at home. It would also strengthen connections to out-of-state trains, improving access to places like Maine, New Hampshire, and Vermont.
Cost, construction, and 2026 status
Rough estimates put the project in the multi-billion-dollar range, depending on how many tracks and stations get built. Supporters note that past studies already predicted tens of millions of dollars in annual savings from more efficient operations and higher ridership, a number that would likely grow with today’s demand.
Engineers envision using Tunnel Boring Machines—the same type of heavy equipment Boston has relied on for other underground projects—to carve a deep, flood-protected tunnel between the stations.
But in 2026, the rail link still hasn’t moved beyond the idea stage. First proposed in 1912, it’s been repeatedly delayed by world events, highway expansion, and shifting political priorities. For now, it stays a favorite “what if” among riders who are still waiting for Boston’s two big stations to finally connect.