Colorado Railroad Museum: Three in Steam By Angela Cotey | June 29, 2021 | Last updated on November 7, 2022 See RGS 20 and Rio Grande 346 and 491 in action Email Newsletter Get the newest photos, videos, stories, and more from Trains.com brands. Sign-up for email today! Get Updates The Colorado Railroad Museum in Golden in May operated all three of its restored steam power, the famous Rio Grande Southern 4-6-0 No. 20, 2-8-0 No. 346, and 2-8-2 No. 491 for a special weekend.