The collection consists of 23 boxes and one large bound minute book. These materials -consisting primarily of correspondence but also including maps, news clippings, photographs, and blueprints -are arranged and bound by topic according to the Southern Pacific's internal organizational schema. There are 160 individual bound items in these 23 boxes. Each grouping is in reverse chronological order as it was originally filed by SP de México administrators.

In order to quote from, publish, or reproduce any of the manuscripts or visual materials, researchers must obtain formal permission from the office of the Library Director. In most instances, permission is given by the Huntington as owner of the physical property rights only, and researchers must also obtain permission from the holder of the literary rights In some instances, the Huntington owns the literary rights, as well as the physical property rights. Researchers may contact the appropriate curator for further information.

Collection is open to qualified researches by prior application through the Reader Services Department. For more information please go to following URL.