Railroad Pass is a mountain pass in Cochise County, Arizona. It divides the Dos Cabezas Mountains and the Pinaleno Mountains at an elevation of , and lies between the Sulphur Springs Valley and San Simon Valley.
History Railroad Pass was named by Lt. John Parke who led the Pacific Railroad Survey 32nd parallel expedition to determine the route of the southernmost route of the transcontinental railroad through southern New Mexico Territory in 1855. Reports of Explorations and Surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean, made under the direction of the Secretary of War, in 1853-4, Volume II, Government Printing Office, Washington, 1855. Report of Lieutenant John G. Parke, Corps Topographical Engineers, upon the Portion of the Route near the Thirty-Second Parallel, Lying Between the Rio Grande and Pimas Village, on the Gila. It is now the route taken by the Southern Pacific Railroad and Interstate 10.
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