Seaboard Coast Line GP40 #1628 was built June 1970 on order #7229-33 and later became Seaboard System #6782, then CSX #6782. Unit left roster and was rebuilt as Union Pacific GP38M-3 #2504
SCL GP40 #1628 leads a northbound pig train past the Callahan depot. She would become SBD and then CSXT 6782, was later rebuilt to UP GP38M-3 #2504. Date of photo approximate.