The Lackawanna Cut-Off (also known as the New Jersey Cut-Off, the Hopatcong-Slateford Cut-Off and the Blairstown Cut-Off) was a rail line built by the Delaware, Lackawanna & Western Railroad (DL&W). Constructed from 1908 to 1911, the line was part of a 396-mile (637 km) main line between Hoboken, New Jersey, and Buffalo, New York. It ran west for 28.6 miles (46.0 km) from Port Morris Junction in Port Morris, New Jersey, near the south end of Lake Hopatcong about 45 miles (72 km) west-northwest of New York City, to Slateford Junction in Slateford, Pennsylvania near the Delaware Water Gap.