SP 6597-6679
These units were built as SP units and renumbered as part of the SP's 1965 systemwide locomotive renumberign plan.
1965 NUMBERS:
SP 6597-6679:
| 1965 road number | Orig. road number | notes |
| SP 6597 | SP 7700 | |
| SP 6598 | SP 7701 | |
| SP 6599 | SP 7702 | |
| SP 6600 | SP 7703 | |
| SP 6601 | SP 7704 | |
| SP 6602 | SP 7705 | |
| SP 6603 | SP 7706 | |
| SP 6604 | SP 7707 | |
| SP 6605 | SP 7708 | |
| SP 6606 | SP 7709 | |
| SP 6607 | SP 7710 | |
| SP 6608 | SP 7711 | |
| SP 6609 | SP 7712 | |
| SP 6610 | SP 7713 | |
| SP 6611 | SP 7714 | |
| SP 6612 | SP 7715 | |
| SP 6613 | SP 7716 | |
| SP 6614 | SP 7717 | |
| SP 6615 | SP 7718 | |
| SP 6616 | SP 7719 | |
| SP 6617 | SP 7720 | |
| SP 6618 | SP 7721 | |
| SP 6619 | SP 7722 | |
| SP 6620 | SP 7723 | |
| SP 6621 | SP 7724 | |
| SP 6622 | SP 7725 | |
| SP 6623 | SP 7726 | |
| SP 6624 | SP 7727 | |
| SP 6625 | SP 7728 | |
| SP 6626 | SP 7729 | |
| SP 6627 | SP 7730 | |
| SP 6628 | SP 7731 | |
| SP 6629 | SP 7732 | |
| SP 6630 | SP 7733 | |
| SP 6631 | SP 7734 | |
| SP 6632 | SP 7735 | |
| SP 6633 | SP 7736 | |
| SP 6634 | SP 7737 | |
| SP 6635 | SP 7738 | |
| SP 6636 | SP 7739 | |
| SP 6637 | SP 7740 | |
| SP 6638 | SP 7741 | |
| SP 6639 | SP 7742 | |
| SP 6640 | SP 7743 | |
| SP 6641 | SP 7744 | |
| SP 6642 | SP 7745 | |
| SP 6643 | SP 7746 | |
| SP 6644 | SP 7747 | |
| SP 6645 | SP 7748 | |
| SP 6646 | SP 7749 | |
| SP 6647 | SP 7750 | |
| SP 6648 | SP 7751 | |
| SP 6649 | SP 7752 | |
| SP 6650 | SP 7753 | |
| SP 6651 | SP 7754 | |
| SP 6652 | SP 7755 | |
| SP 6653 | SP 7756 | |
| SP 6654 | SP 7757 | |
| SP 6655 | SP 7758 | |
| SP 6656 | SP 7759 | |
| SP 6657 | SP 7760 | |
| SP 6658 | SP 7761 | |
| SP 6659 | SP 7762 | |
| SP 6660 | SP 7763 | |
| SP 6661 | SP 7764 | |
| SP 6662 | SP 7765 | |
| SP 6663 | SP 7766 | |
| SP 6664 | SP 7767 | |
| SP 6665 | SP 7768 | |
| SP 6666 | SP 7769 | |
| SP 6667 | SP 7770 | |
| SP 6668 | SP 7771 | |
| SP 6669 | SP 7772 | |
| SP 6670 | SP 7773 | |
| SP 6671 | SP 7774 | |
| SP 6672 | SP 7775 | |
| SP 6673 | SP 7776 | |
| SP 6674 | SP 7777 | |
| SP 6675 | SP 7778 | |
| SP 6676 | SP 7779 | |
| SP 6677 | SP 7780 | |
| SP 6678 | SP 7781 | |
| SP 6679 | SP 7782 |