Santa Fe GP9 2940, with an F unit trailing, and Southern Pacific GP9E 3337 pose together in the terminal area at Fort Worth in March 1973. The AT&SF unit's original number was 740 when delivered by EMD in 1956, and it was later renumbered to 2253. Its subsequent history could not be established. The SP unit also began life as GP9 5658 in 1956; it was renumbered to 3481 in 1966, and was renumbered to 3337 when rebuilt to GP9E specifications in 1971. Tracing its subsequent history has likewise proved elusive.