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In page Abner Doubleday:

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Doubleday mustered out of the volunteer service after the Civil War on August 24, 1865, reverted to the rank of lieutenant colonel, and in September 1867 became the colonel of the 35th U.S. Infantry. He was stationed in San Francisco from 1869 through 1871 and he took out a patent for the cable car railway that still runs there and received a charter for its operation, but signed away his rights when he was reassigned.[citation needed] In 1871, he commanded the 24th U.S. Infantry, an all African-American regiment with headquarters at Fort McKavett, Texas.[1] He retired in 1873.