This Alco HH600 switcher was built by Alco in 1938, and was the Green Bay Route's first diesel-electric locomotive. It originally wore a plain black paint scheme with white lettering but was painted in this red and gray scheme to match the Alco FA-1 road locomotives which arrived in 1947-49.

Besides being the first diesel locomotive on the railroad, it also had the distinction of being the first locomotive to leave the roster. In April 1956 it was sold to United Electric Coal Company of Illinois, where it kept its basic GBW paint scheme until at least 1961. It was scrapped about 1976.

Thanks goes out to Dave Simonis of Stevens Point for sharing this photo!