Troop train in the Sierras By Angela Cotey | December 28, 2022 | 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 A Southern Pacific 4-8-8-2 leads a long string of troop sleepers on snowy Donner Pass in the mid-1940s. Pullman-Standard built 2,400 of the boxcar-like sleepers between October 1943 and May 1946. Classic Trains coll.