The Portsmouth, Great Falls and Conway Railroad (PGF&C) is a former rail line between Rollinsford and Intervale, New Hampshire, in the United States. At Rollinsford, the line connected to other lines to provide service between the White Mountains and coastal cities such as Boston. At Intervale, it connected to the Mountain Division of the Maine Central Railroad. The rail line takes its name from the city of Portsmouth, near its southern terminus; the city of Somersworth ; and the town of Conway, near its northern terminus. Today, the infrastructure of the former PGF&C is owned by different entities, including the State of New Hampshire, the Conway Scenic Railroad, and the New Hampshire Northcoast Corporation. Some segments are still operated as freight or heritage railways, while other segments are being maintained as rail trails.

The Boston and Maine Railroad was a U.S. Class I railroad in northern New England. Originally chartered in 1835, it became part of what was the Pan Am Railways network in 1983.