SP SW8 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.
| 1965 numbers | Orig. numbers | notes |
| SP 1100-1103 | SP 4600-4603 | TR6A |
| SP 1104-1108 | T&NO 12-16 | |
| SP 1109-1128 | SP 4604-4623 | dynamic brakes |
| SP 1150-1153 | SP 4700-4703 | TR6B |