SP C-630 page: Switcher renumbering
Heavy Switcher Renumbering:
In 1972-1974, the SP began a program to reassign its six motor ALCO road engines to heavy switchers. Some were assigned to West Colton yard in California, some were assigned to Englewood Yard in Houston, TX and some were assigned to bridge pull service in Avondale, LA. All but one unit was done, this unit became a heavy yard slug assigned to work with SD38-2's at West Colton yard.
| Switcher number | original number |
| SP 3140 | SP 7800 |
| SP 3141 | SP 7801 |
| SP 3142 | SP 7812 |
| SP 3143 | SP 7809 |
| SP 3144 | SP 7813 |
| SP 3145 | SP 7803 |
| SP 3146 | SP 7804 |
| SP 3147 | SP 7805 |
| SP 3148 | SP 7807 |
| SP 3149 | SP 7814 |
| SP 3150 | SP 7810 |
| SP 3151 | SP 7802 |
| SP 3152 | SP 7808 |
| SP 3153 | SP 7806 |