The ALCO RS-1 was a diesel-electric locomotive built by Alco-GE between 1941 and 1953 and the American Locomotive Company from 1953 to 1960. This model has the distinction of having the longest production run of any diesel locomotive for the North American market. The car-body configuration of the RS-1 pioneered the road switcher type of diesel locomotive. Southern Railway owned 9 of these units.
On the A&BR an old RS-1 pulls the “Afternoon Local,” a shabby three car “milk train” supplying local serve to “shake-rags” and small villages along the line.