English: Unrecorded early California Railroad Map, one of the first printed maps to focus on the routes serviced by a single California Railroad.

The California Pacific Railroad Company was incorporated in 1865 in San Francisco as the California Pacific Rail Road Company. It was renamed the California Pacific Railroad Extension Company in the spring of 1869, then renamed the California Pacific Railroad later that same year. The railroad was constructed just months prior to the completion of the Central Pacific/Union Pacific Transcontinental Railway.

The present map is a fascinating look at the history of the California Pacific Railroad, during the brief period where it was operated by its original builder, D.C. Haskin. The map show the lines of the CPRR as they existed at some point in time between the second half of 1868 (based upon information depicted on the neighboring line between Healdsburg and Sonoma which was never in fact constructed), the time of the acquistion of the Napa Valley Rail Road Company (June 9, 1869) and the sale of the Railroad by Haskin to investors led by former California Governor and Senator Milton Slocum Latham (January 15, 1870). The Napa Valley R.R. is still shown as being a connection, rather than part of the CPRR, but the line from Davis to Sacramento is shown as completed, which did not occur until January 1870.