SSW 3641-3652
These units were built as Cotton Belt (SSW) units and renumbered as part of the SP's 1965 systemwide locomotive renumberign plan.
ORIGINAL NUMBERS:
SP 3653-3662:
| 1965 road number | Orig. road number | notes |
| SSW 3641 | SSW 820 | |
| SSW 3642 | SSW 821 | |
| SSW 3643 | SSW 822 | |
| SSW 3644 | SSW 823 | |
| SSW 3645 | SSW 824 | |
| SSW 3646 | SSW 825 | |
| SSW 3647 | SSW 826 | |
| SSW 3648 | SSW 827 | |
| SSW 3649 | SSW 828 | |
| SSW 3650 | SSW 829 | |
| SSW 3651 | SSW 830 | |
| SSW 3652 | SSW 831 |