The CF7 is an EMD F-unit 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 road switching duty. All of the conversions were performed by the Atchison, Topeka and Santa Fe Railway in their Cleburne, Texas workshops between October, 1970 and March, 1978. The program was initiated in response to a system-wide need for more than 200 additional four-axle diesel hood units to meet projected motive power demands on branch lines and secondary main lines.