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| The Nashua, Acton & Boston Railroad built this beautiful stone arch bridge without mortar in Westford, MA. When this photo was taken in September 1992, trains had not crossed it for nearly 70 years. |
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| The Nashua, Acton & Boston Railroad built this beautiful stone arch bridge without mortar in Westford, MA. When this photo was taken in September 1992, trains had not crossed it for nearly 70 years. |