In 1960, EMD built a pair of light roadswitchers, consisting of switcher carbodies and mechanicals on longer roadswitcher frames. These were given the designation of RS1325, RS denoting a roadswitcher not part of a specific series, and 1325 denoting the unit’s horsepower. The RS1325’s were 4-axle, B-B diesels constructed by GM-EMD in September of 1960. They had, similarly to the NW5 switchers, a short hood to contain auxiliaries and a steam generator for passenger equipment, as they were originally intended for passenger switching in Chicago. Despite these capabilities, these two units have only hauled freight for their entire lives, as the market for passenger switchers was drying up.
Only two units of this type were produced in total, serial numbers #25773 and #25774. They made up order #4438, placed by the Chicago & Illinois Midland Railway, and they were given the numbers #30 and #31 in service. A green paint scheme with a thin red stripe adorned them until the C&IM was renamed as the Illinois & Midland Railroad when they were bought by Genesee & Wyoming Inc. and added to the G&M’s ever-increasing roster of shortlines. Up until 2009, both units remained in active use with the I&M with the same numbers, but #31 is currently in pieces in the TZPR shops in Peoria, IL.