SP F-units page: 1949 renumbering
1965 Renumbering:
In late 1949, the SP began a program to renumber its growing fleet of cab and booster units which had been mostly delivered in four unit ABBA sets with each locomotive in a set given an alpha suffix. Other cab and booster units were included such as EMD E-units and ALCO PA & PB units, but are not included here. Neither T&NO nor SSW F7's ever carried alpha suffixes. Note that the SSW FT units were renumbered in a way such that the original "set" numbers used with the alpha suffixes were not re-used.
SP:
| 1949 numbers | Orig. numbers | |
| SP 6100-6139 | SP 6100A,D-6119A,D | SP 6100-6117 not applied |
| SP 6140-6179 | SP 6120A,D-6139A,D | |
| SP 6180-6185 | SP 6140A,D-6142A,D | |
| SP 6186-6239 | SP 6143A,D-6169A,D | |
| SP 8000-8039 | SP 6100B,C-6119B,C | SP 8000-8017 not applied |
| SP 8040-8079 | SP 6120B,C-6139B,C | |
| SP 8080-8085 | SP 6140B,C-6142B,C | |
| SP 8086-8139 | SP 6143B,C-6169B,C |
SSW:
| 1949 numbers | Orig. numbers | |
| SSW 901 | SSW 900A | |
| SSW 902 | SSW 900B | |
| SSW 903 | SSW 900D | |
| SSW 904 | SSW 900C | |
| SSW 906 | SSW 905B | |
| SSW 907 | SSW 905A | |
| SSW 908 | SSW 905C | |
| SSW 909 | SSW 905D | |
| SSW 911 | SSW 910A | |
| SSW 912 | SSW 910B | |
| SSW 913 | SSW 910D | |
| SSW 914 | SSW 910C | |
| SSW 916 | SSW 915B | |
| SSW 917 | SSW 915A | |
| SSW 918 | SSW 915C | |
| SSW 919 | SSW 915D | |
| SSW 921 | SSW 920A | |
| SSW 922 | SSW 920B | |
| SSW 923 | SSW 920D | |
| SSW 924 | SSW 920C |