Photo of the Day By Angela Cotey | October 19, 2020 | Last updated on August 8, 2025 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates Troop train on the SP A doubleheaded troop train passes the Army’s Camp San Luis Obispo as it climbs Cuesta Grade on Southern Pacific’s L.A.–San Francisco Coast Line in the early 1940s. SP photo Share this article Print Facebook