SSW 6680-6681
These units were built as SSW units and renumbered as part of the SP's 1965 systemwide locomotive renumbering plan. They retained their Cotton Belt identities.
1965 NUMBERS:
SSW 6680-6681:
| 1965 road number | Orig. road number | notes |
| SSW 6680 | SSW 780 | |
| SSW 6681 | SSW 781 |