Seaboard System GP38-2 #4079 is the trailing unit on a northbound with a U36B, GP38-2 and GP40-2. Seaboard System GP38-2 #4079 was built September 1972 as Louisville & Nashville #4079 and later became CSX 2589. Unit left roster and became HLLX 2589, SP 159, SP 4854, and HLCX 3850