The section of the Northeast Corridor that Shore Line East operates on was once the New York-Boston mainline of the New York, New Haven and Hartford Railroad. The section from New Haven to New London was built as the New Haven & New London Railroad. It was charted in 1848, began construction in 1850, and opened for service in July 1852. The line was owned by the New York, Providence and Boston Railroad (the "Stonington Road") from 1858 to 1862, and by the Shore Line Railway from 1864 until it was acquired by the New York, New Haven, and Hartford Railroad (the "New Haven") in 1870. Crossing the Connecticut River required a ferry transfer until a drawbridge was built in 1870.