This collection consists primarily of correspondence, as well as maps, news clippings, photographs, and blueprints, of the Southern Pacific of Mexico railroad line (SP de México), dating from 1885 to 1954.

The Ferrocarril Sud Pacífico de México (SP de México) line began as the Sonora Railway in 1882, first owned and operated by the Atcheson, Topeka & Santa Fe. It ran from Nogales, Arizona down to the port of Guaymas, 423 kilometers southeast of Nogales. The Southern Pacific acquired the line through a reciprocal trade with the AT&SF in 1898, and incorporated the line as a separate corporate entity, the SP de México, in June 1909. The line was gradually extended south from Nogales and north from Guadalajara. When the Mexican Revolution erupted late in 1910, construction of the line was essentially halted until 1923. In 1927 the line was finally connected from Guadalajara to the U.S./Mexican border. It operated in Mexico until 1951, when the Mexican government purchased the line from the Southern Pacific.

160 bound items in 23 boxes, and one large bound minute book.

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