SP 8574-8706
These units were purchased by SP rebuilt from various SD40, SD45 and SDP45 (EL/CR.)'s. They were upgraded to SD40-2 standards and given the model designation SD40M-2. They lacked the typical gyralight option that SP had previously specified on their locomotives.
SP 8574-8706:
| SP number | Orig. number;model | const. number |
| SP 8574 | C&NW 971; SD45 (GP40 hood) | 7148-35 |
| SP 8575 | C&NW 914; SD45 (GP40 hood) | 7945-14 |
| SP 8576 | C&NW 905; SD45 (GP40 hood) | 7945-5 |
| SP 8577 | C&NW 909; SD45 (GP40 hood) | 7945-9 |
| SP 8578 | C&NW 956; SD45 (GP40 hood) | 7148-20 |
| SP 8579 | C&NW 968; SD45 (GP40 hood) | 7148-32 |
| SP 8580 | C&NW 973; SD45 (GP40 hood) | 7148-37 |
| SP 8581 | C&NW 958; SD45 (GP40 hood) | 7148-22 |
| SP 8582 | C&NW 951; SD45 (GP40 hood) | 7148-15 |
| SP 8583 | MP 783; SD40 | 7319-14 |
| SP 8584 | SP 9074; SD45 | 7170-6 |
| SP 8585 | SP 9130; SD45 | 7217-7 |
| SP 8586 | SL-SF 910; SD45 | 7970-4 |
| SP 8587 | BN 6552; SD45 | 5794-10 |
| SP 8588 | SP 9020; SD45 | 7138-33 |
| SP 8589 | SP 9151; SD45 | 7217-28 |
| SP 8590 | SP 9085; SD45 | 7170-17 |
| SP 8591 | SCL 2020; SD45 | 7123-11 |
| SP 8592 | ACL 1025; SD45 | 5703-2 |
| SP 8593 | SCL 2015; SD45 | 7123-6 |
| SP 8594 | SCL 2037; SD45 | 5784-14 |
| SP 8595 | PRR 6193; SD45 | 7993-24 |
| SP 8596 | SCL 2042; SD45 | 5784-19 |
| SP 8597 | SCL 2017; SD45 | 7123-8 |
| SP 8598 | CB&Q 523; SD45 | 7147-8 |
| SP 8599 | SCL 2013; SD45 | 7123-4 |
| SP 8600 | ACL 1024; SD45 | 5703-1 |
| SP 8601 | ACL 1032; SD45 | 5703-9 |
| SP 8602 | SCL 2016; SD45 | 7123-7 |
| SP 8603 | CB&Q 526; SD45 | 7147-11 |
| SP 8604 | SCL 2027; SD45 | 5784-4 |
| SP 8605 | SSW 9058; SD45 | 7140-7 |
| SP 8606 | PRR 6211; SD45 | 7993-32 |
| SP 8607 | PRR 6212; SD45 | 7993-33 |
| SP 8608 | PRR 6188; SD45 | 7993-19 |
| SP 8609 | BN 6474; SD45 | 7261-3 |
| SP 8610 | PRR 6203; SD45 | 7091-2 |
| SP 8611 | PRR 6187; SD45 | 7993-18 |
| SP 8612 | CB&Q 516; SD45 | 7147-1 |
| SP 8613 | PRR 6226; SD45 | 7993-47 |
| SP 8614 | PRR 6202; SD45 | 7090-2 |
| SP 8615 | PRR 6198; SD45 | 7993-29 |
| SP 8616 | PRR 6208; SD45 | 7090-5 |
| SP 8617 | SP 8962; SD45 | 7082-28 |
| SP 8618 | GN 425; SD45 | 7088-8 |
| SP 8619 | BN 6520; SD45 | 5773-23 |
| SP 8620 | BN 6496; SD45 | 7279-5 |
| SP 8621 | AT&SF 1818; SD45 | 5708-19 |
| SP 8622 | BN 6491; SD45 | 7261-20 |
| SP 8623 | AT&SF 1835; SD45 | 5722-6 |
| SP 8624 | UP 3057; SD40 | 7932-10 |
| SP 8625 | UP 3000; SD40 | 7865-1 |
| SP 8626 | CGW 403; SD40 | 7912-3 |
| SP 8627 | WM 7448; SD40 | 7172-4 |
| SP 8628 | C&O 7461; SD40 | 7907-5 |
| SP 8629 | B&O 7492; SD40 | 7998-11 |
| SP 8630 | CRR 3007; SD40 | 5710-8 |
| SP 8631 | UP 3014; SD40 | 7865-15 |
| SP 8632 | UP 3101; SD40 | 7324-19 |
| SP 8633 | C&O 7452; SD40 | 7886-3 |
| SP 8634 | MP 759; SD40 | 7214-6 |
| SP 8635 | UP 3008; SD40 | 7865-9 |
| SP 8636 | KCS 603; SD40 | 7914-4 |
| SP 8637 | KCS 628; SD40 | 7222-1 |
| SP 8638 | UP 3028; SD40 | 7868-4 |
| SP 8639 | KCS 629; SD40 | 7222-2 |
| SP 8640 | L&N 1227; SD40 | 5709-3 |
| SP 8641 | C&O 7460; SD40 | 7907-4 |
| SP 8642 | KCS 636; SD40 | 7222-5 |
| SP 8643 | C&O 7451; SD40 | 7886-2 |
| SP 8644 | MP 706; SD40 | 7962-7 |
| SP 8645 | MP 708; SD40 | 7962-9 |
| SP 8646 | MP 709; SD40 | 7962-10 |
| SP 8647 | UP 3098; SD40 | 7324-16 |
| SP 8648 | C&NW 967; SD45 | 7148-31 |
| SP 8649 | C&NW 959; SD45 | 7148-23 |
| SP 8650 | C&NW 907; SD45 | 7945-7 |
| SP 8651 | C&NW 917; SD45 | 7945-17 |
| SP 8652 | PRR 6230; SD45 | 7993-51 |
| SP 8653 | GN 424; SD45 | 7088-7 |
| SP 8654 | PRR 6206; SD45 | 7090-4 |
| SP 8655 | PRR 6192; SD45 | 7993-23 |
| SP 8656 | BN 6473; SD45 | 7261-2 |
| SP 8657 | PRR 6238; SD45 | 7125-4 |
| SP 8658 | UP 3027; SD40 | 7868-3 |
| SP 8659 | SOU 3136; SD45 | 7068-15 |
| SP 8660 | SOU 3118; SD45 | 7074-14 |
| SP 8661 | N&W 1770; SD45 | 7199-6 |
| SP 8662 | PRR 6215; SD45 | 7993-36 |
| SP 8663 | C&NW 906; SD45 | 7945-6 |
| SP 8664 | C&NW 911; SD45 | 7945-11 |
| SP 8665 | C&NW 957; SD45 | 7148-21 |
| SP 8666 | C&NW 964; SD45 | 7148-28 |
| SP 8667 | C&NW 944; SD45 | 7148-8 |
| SP 8668 | CB&Q 522; SD45 | 7147-7 |
| SP 8669 | CB&Q 525; SD45 | 7147-10 |
| SP 8670 (1st/2nd) | C&NW 913; SD45 (GP40 hood 2nd) | 7945-13 |
| SP 8671 | C&NW 948; SD45 | 7148-12 |
| SP 8672 | C&NW 974; SD45 | 7148-38 |
| SP 8673 | C&NW 904; SD45 | 7945-4 |
| SP 8674 | C&NW 912; SD45 | 7945-12 |
| SP 8675 | PRR 6196; SD45 | 7993-27 |
| SP 8676 | SCL 2023; SD45 | 7123-14 |
| SP 8677 | SCL 2039; SD45 | 5784-16 |
| SP 8678 | D&RGW 5319; SD45 | 7951-5 |
| SP 8679 | SOU 3166; SD45 | 5755-7 |
| SP 8680 | D&RGW 5327; SD45 | 7085-3 |
| SP 8681 | N&W 1753; SD45 | 7988-15 |
| SP 8682 | D&RGW 5337; SD45 | 7106-1 |
| SP 8683 | N&W 1767; SD45 | 7199-3 |
| SP 8684 | D&RGW 5338; SD45 | 7106-2 |
| SP 8685 | SOU 3151; SD45 | 7068-30 |
| SP 8686 | UP 3079; SD40 | 7932-32 |
| SP 8687 | MP 728; SD40 | 7995-9 |
| SP 8688 | MP 711; SD40 | 7962-12 |
| SP 8689 | UP 3103; SD40 | 7324-21 |
| SP 8690 | BN 6567; SD45 | 5794-25 |
| SP 8691 | EL 3654; SDP45 | 7246-1 |
| SP 8692 | EL 3668; SDP45 | 7246-15 |
| SP 8693 | EL 3666; SDP45 | 7246-13 |
| SP 8694 | EL 3665; SDP45 | 7246-12 |
| SP 8695 | EL 3662; SDP45 | 7246-9 |
| SP 8696 | EL 3659; SDP45 | 7246-6 |
| SP 8697 | C&NW 920; SD45 | 7945-20 |
| SP 8698 | C&NW 908; SD45 | 7945-8 |
| SP 8699 | C&NW 915; SD45 | 7945-15 |
| SP 8700 | C&NW 901; SD45 (GP40 hood) | 7945-1 |
| SP 8701 | C&NW 941; SD45 | 7148-5 |
| SP 8702 | C&NW 940; SD45 | 7148-4 |
| SP 8703 | C&NW 977; SD45 | 7148-41 |
| SP 8704 | C&NW 916; SD45 | 7945-16 |
| SP 8705 | C&NW 966; SD45 | 7148-30 |
| SP 8706 | C&NW 949; SD45 | 7148-13 |