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.

Pan Am Railways, Inc. (PAR) is a subsidiary of CSX Corporation that operates Class II regional railroads covering northern New England from Mattawamkeag, Maine, to Rotterdam Junction, New York. Pan Am Railways is primarily made up of former Class II regional railroads such as Boston and Maine Corporation, Maine Central Railroad Company, Portland Terminal Company, and Springfield Terminal Railway Company. It was formerly known as Guilford Transportation Industries and was also known as Guilford Rail System. Guilford bought the name, colors, and logo of Pan American World Airways in 1998.