SP GP35 page: 1965 system renumbering
1965 Renumbering:
In late 1965, the SP began a program to renumber the majority of its locomotive fleet into a consolodated system without regard for reporting mark. However, the SSW units did retain their identity, but the numbers were assigned within the overall scheme.
SSW:
| 1965 numbers | Orig. numbers | notes |
| SSW 6500-6519 | SSW 760-779 |
SP:
| 1965 numbers | Orig. numbers | notes |
| SP 6520-6596 | SP 7408-7484 | |
| SP 6597-6679 | SP 7700-7782 |
SSW:
| 1965 numbers | Orig. numbers | notes |
| SSW 6680-6681 | SSW 780-781 |