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Imagine finishing lunch at any of the wildly popular restaurants of Fort Point Channel, walking around the corner, and boarding a direct train that will shuttle you in ten minutes to the figurative heart of Boston, Copley Square. Turns out this is not just your imagination. The state, with no fanfare, has set aside tens of millions of dollars to launch an innovative train service on a dormant rail line between a pair of the city’s most vital neighborhoods – the Seaport District and the Back Bay. The service should be ready to go in just two years. The solution comes in the form of a skinny little stretch of barren rail that runs from the South Bay Rail Yard into the South Boston Waterfront, known as Track 61.