The Santa Fe CF7 is an EMD F7 railroad locomotive that has had its streamlined carbody removed and replaced with a custom-made "general purpose" body in order to adapt the unit for switching duty. As the original carbody was a structural component, all of the CF7s received strengthened side sills as part of the conversion. All of the conversions were performed by the Atchison, Topeka & Santa Fe Railway's Cleburne, Texas, workshops between February 1970 and March 1978. This was Santa Fe's most notable remanufacturing project, with 233 units completed during that time. The program was initiated in response to a system-wide need for more than 200 additional four-axle diesel road switchers to meet projected motive power demands on branch lines and secondary main lines.