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