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The Portsmouth and Concord Railroad (later the Concord and Portsmouth Railroad) was a railroad in New Hampshire (United States) that existed under various names from 1845 to 1945.
Two railway companies were founded in July 1845: the Portsmouth, New Market and Concord Railroad, and the Portsmouth, New Market and Exeter Railroad. Both were given the concession to construct and operate a rail line from Portsmouth to a point on the Concord Railroad between Manchester and Concord called Bow Junction. The companies merged on December 23, 1845, forming the Portsmouth and Concord Railroad.