SP 3551-3570
These units were built as T&NO 429-448 and renumbered as part of the SP's 1965 systemwide locomotive renumberign plan.
SP 3551-3560 (orig. T&NO 429-438):
| 1965 road number | Orig. road number | notes |
| SP 3551 | T&NO 429 | |
| SP 3552 | T&NO 430 | |
| SP 3553 | T&NO 431 | |
| SP 3554 | T&NO 432 | |
| SP 3555 | T&NO 433 | |
| SP 3556 | T&NO 434 | |
| SP 3557 | T&NO 435 | |
| SP 3558 | T&NO 436 | |
| SP 3559 | T&NO 437 | |
| SP 3560 | T&NO 438 |
SP 3561-3570 (orig. T&NO 439-448):
| SP 3561 | T&NO 439 | |
| SP 3562 | T&NO 440 | |
| SP 3563 | T&NO 441 | |
| SP 3564 | T&NO 442 | |
| SP 3565 | T&NO 443 | |
| SP 3566 | T&NO 444 | |
| SP 3567 | T&NO 445 | |
| SP 3568 | T&NO 446 | |
| SP 3569 | T&NO 447 | |
| SP 3570 | T&NO 448 |