Russell Montague Clement, son of L.M. Clement was an engineer for the Southern Pacific Railroad Co., the Pacific Improvement Co. and the City Engineer for Oakland, Calif.
Lewis Metzler Clement was a railroad engineer for the Central Pacific Railroad and Southern Pacific Railroad. Projects included working on a pass through the Sierra Nevada Mountains and cable car lines for the Market Street Cable Railway Co.
From the description of Photographs from the Clement family documents relating to San Francisco cable cars [graphic]. ca. 1880-ca. 1910. (University of California, Berkeley). WorldCat record id: 768267003