SP U50 page: 1965 & 1969 renumberings
1965 Renumbering:
In late 1965, the SP began a program to renumber the majority of its locomotive fleet into a consolodated system. The U50's were renumbered along with the rest of the fleet. They were also renumbered again in 1969.
| Orig. numbers | 1965 numbers | 1969 numbers |
| SP 8500 | SP 9550 | SP 9950 |
| SP 8501 | SP 9551 | SP 9951 |
| SP 8502 | SP 9552 | SP 9952 |