From Grand Central Station, the route connects to Danbury, CT, either by following Metro North’s New Haven Line, or by following the Harlem line to the Southeast Station and following the Maybrook Line to Danbury. From there it passes through Connecticut and Massachusetts, with proposed stops at New Milford, Kent, Cornwall Bridge, and Canaan, CT, and then moves on to Great Barrington, Stockbridge, Lee, Lenox, and Pittsfield, MA.
Most of the rail in Massachusetts and Connecticut is 107-pound jointed rail, built almost a century ago. Passenger rail service cannot operate along the Berkshire Line unless all the old ties and jointed rail are replaced with new ties and 136-pound welded rail. It will take 3-5 years and an estimated $200-250 million to do this.