MoPac 4-6-2, Cotton Belt 4-6-0 By Angela Cotey | December 14, 2022 Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates Missouri Pacific 4-6-2 6621 and St. Louis-Southwestern 4-6-0 663 await their next assignments at the Memphis Union Station engine house in October 1950. James G. La Vake photo