Trucks: B-B
Engine: 12-251-C3, 2,000 hp
Gear ratio: 65:18
Maximum speed: 65 mph
Operating weight (lbs.): 248,000
Tractive effort (lbs.): 50,000
Length: 61′ – 0″
Were renumbered from 2500 series after weight was reduced by reducing fuel capacity from 2,500 gallons to 1,200 gallons and sand capacity from 56 cubic feet to 18 cubic feet. As part of the conversion snow plow pilots were added to the rear and bay windows were installed on the cab windows.
| Road no. | Class | Build date | Builder’s no. | Former road no. | Renumbering date | Retired | Notes / disposition |
| 3500 | MR-20a | Jun 73 | M6071-01 | 2500 | Nov 25 97 | To CANAC, to Kelowna Pacific No. 3500, to Lake States Railway No. 3500 (KP Knighthawk grey paint) Jun 2004, stored by Mar 2011, Scrapped by LSRC c. Nov 2011 | |
| 3501 | MR-20a | May 73 | M6071-02 | 2501 | Nov 25 97 | To St. Lawrence & Atlantic (Quebec), to Hudson’s Bay Railway 2003 | |
| 3502 | MR-20a | May 73 | M6071-03 | 2502 | Feb 5 98 | To Ottawa Valley Railink Feb 20 98, to Southern Ontario Railway, to Hudson Bay Railway | |
| 3503 | MR-20a | Jun 73 | M6071-04 | 2503 | Jun 25 97 | Scrapped Mont Joli QC 1997 | |
| 3504 | MR-20a | Jun 73 | M6071-05 | 2504 | Dec 11 97 | To CANAC, to Kelowna Pacific, to Lake States Railway No. 3504 (painted blue) Jun 2004, Scrapped by LSRC c. Nov 2011 | |
| 3505 | MR-20a | Jun 73 | M6071-06 | 2505 | Mar 28 98 | To St. Lawrence & Atlantic (Quebec) No. 3505, to Hudson Bay Railway 2003, scrapped The Pas, MB 2008 | |
| 3506 | MR-20a | Jun 73 | M6071-07 | 2506 | Aug 19 96 | Scrapped Mont Joli QC 1997 | |
| 3507 | MR-20a | Jun 73 | M6071-08 | 2507 | Jun 5 96 | Scrapped Mont Joli QC 1997 | |
| 3508 | MR-20a | Jun 73 | M6071-09 | 2508 | Feb 16 98 | To Ottawa Valley Railink Feb 20 98, to Southern Ontario Railway, to Hudson Bay Railway, scrapped The Pas MB 2008 | |
| 3509 | MR-20a | Jun 73 | M6071-10 | 2509 | Feb 16 98 | To Ottawa Valley Railink Feb 20 98, to Southern Ontario Railway, to Hudson Bay Railway, scrapped The Pas MB 2008 | |
| 3510 | MR-20a | Jun 73 | M6071-11 | 2510 | Jan 23 89 | To Tennken Railroad (Dyersville TN) 1998, to West Tennessee Railroad | |
| 3512 | MR-20a | Jul 73 | M6071-13 | 2512 | Mar 28 98 | To St. Lawrence & Atlantic (Quebec) No. 3512, to Hudson’s Bay Railway 2003 | |
| 3513 | MR-20a | Jul 73 | M6071-14 | 2513 | Aug 27 96 | Scrapped Mont Joli QC 1997 | |
| 3514 | MR-20a | Jul 73 | M6071-15 | 2514 | Mar 9 98 | To National Railway Equipment (Dixmoor IL) 1998, to Great Western Railway Apr 2001 | |
| 3515 | MR-20a | Jul 73 | M6071-16 | 2515 | Nov 25 97 | To CANAC, to Kelowna Pacific Railway, to Lake States Railway May 2004 (patched CN paint) | |
| 3516 | MR-20a | Jul 73 | M6071-17 | 2516 | Feb 13 98 | To St. Lawrence & Atlantic (Quebec) No. 3516, to Hudson’s Bay Railway 2003 | |
| 3517 | MR-20a | Aug 73 | M6071-18 | 2517 | Feb 13 98 | To St. Lawrence & Atlantic (Quebec) No. 3519 1998, to New Hampshire Central, to Southern Railway of New Jersey No. 803 | |
| 3518 | MR-20a | Aug 73 | M6071-19 | 2518 | Nov 25 97 | To CANAC, to Southern Manitoba, to Victoria & Southern Railway (Attica KS) 2003 | |
| 3519 | MR-20a | Aug 73 | M6071-20 | 2519 | Feb 13 98 | To St. Lawrence & Atlantic (Quebec) No. 3517 1998, to New Hampshire Central, to Southern Railway of New Jersey No. 803 | |
| 3520 | MR-20a | Aug 73 | M6071-21 | 2520 | Dec 13 96 | Scrapped Mont Joli QC 1997 | |
| 3521 | MR-20a | Oct 73 | M6071-22 | 2521 | Nov 20 96 | Equipped with Pacesetter for Westray Mine (Plymouth NS) service 1992, Scrapped Mont Joli QC 1997 | |
| 3522 | MR-20a | Sep 73 | M6071-23 | 2522 | Mar 1 98 | Equipped with Pacesetter for Westray Mine (Plymouth NS) service 1992, To National Railway Equipment (Dixmoor IL) 1998, to Great Western Railway 2000 | |
| 3523 | MR-20a | Sep 73 | M6071-24 | 2523 | Nov 28 96 | Equipped with Pacesetter for Westray Mine (Plymouth NS) service 1992, Scrapped Mont Joli QC 1997 | |
| 3524 | MR-20a | Sep 73 | M6071-25 | 2524 | Nov 4 96 | Equipped with Pacesetter for Westray Mine (Plymouth NS) service 1992, Wrecked | |
| 3525 | MR-20a | Sep 73 | M6071-26 | 2525 | Jun 13 96 | Equipped with Pacesetter for Westray Mine (Plymouth NS) service 1992, Scrapped Mont Joli QC 1997 | |
| 3527 | MR-20a | Sep 73 | M6071-28 | 2527 | Oct 29 96 | Scrapped Mont Joli QC 1997 | |
| 3528 | MR-20a | Sep 73 | M6071-29 | 2528 | Oct 24 97 | To National Railway Equipment (Dixmoor IL) 1998 | |
| 3529 | MR-20a | Sep 73 | M6071-30 | 2529 | Jun 5 96 | Scrapped Mont Joli QC 1997 | |
| 3530 | MR-20b | Apr 74 | M6081-01 | 3530 | Sep 28 98 | To Hudson Bay Railway 1998 | |
| 3531 | MR-20b | Apr 74 | M6081-02 | 3531 | Feb 5 98 | To National Railway Equipment (Dixmoor IL) 1998 | |
| 3532 | MR-20b | Apr 74 | M6081-03 | 3532 | Sep 21 98 | To Carlton Trail Railway 1998 | |
| 3533 | MR-20b | Apr 74 | M6081-04 | 3533 | Sep 21 98 | To Hudson Bay Railway 1998 | |
| 3534 | MR-20b | Apr 74 | M6081-05 | 3534 | Aug 19 91 | Fire damage (Deersdale NB) Feb 23 90 | |
| 3536 | MR-20b | Apr 74 | M6081-07 | 3536 | Jan 10 97 | To Kelowna Pacific Railway for parts | |
| 3537 | MR-20b | Apr 74 | M6081-08 | 3537 | May 23 95 | ||
| 3538 | MR-20b | Apr 74 | M6081-09 | 3538 | Sep 21 98 | To Hudson Bay Railway 1998 | |
| 3539 | MR-20b | Apr 74 | M6081-10 | 3539 | Sep 21 98 | To Hudson Bay Railway 1998 | |
| 3540 | MR-20b | Apr 74 | M6081-11 | 3540 | Sep 21 98 | To Carlton Trail Railway, scrapped early 2003 | |
| 3541 | MR-20b | Apr 74 | M6081-12 | 3541 | Sep 21 98 | To Carlton Trail Railway | |
| 3542 | MR-20b | Apr 74 | M6081-13 | 3542 | Oct 28 98 | To Hudson Bay Railway 1998 | |
| 3543 | MR-20b | May 74 | M6081-14 | 3543 | Sep 21 98 | To Hudson Bay Railway | |
| 3544 | MR-20b | May 74 | M6081-15 | 3544 | Sep 21 98 | To Hudson Bay Railway | |
| 3545 | MR-20b | May 74 | M6081-16 | 3545 | Sep 28 98 | To Hudson Bay Railway | |
| 3546 | MR-20b | May 74 | M6081-17 | 3546 | Sep 21 98 | To National Railway Equipment (Dixmoor IL) | |
| 3547 | MR-20b | May 74 | M6081-18 | 3547 | Sep 21 98 | To Hudson Bay Railway, scrapped at The Pas MB 2008 | |
| 3548 | MR-20b | May 74 | M6081-19 | 3548 | Sep 21 98 | To Hudson Bay Railway | |
| 3549 | MR-20b | May 74 | M6081-20 | 3549 | Sep 21 98 | To Carlton Trail Railway | |
| 3550 | MR-20b | May 74 | M6081-21 | 3550 | Sep 21 98 | To Hudson Bay Railway | |
| 3551 | MR-20b | May 74 | M6081-22 | 3551 | Sep 21 98 | To Hudson Bay Railway | |
| 3553 | MR-20b | Jun 74 | M6081-24 | 3553 | Sep 21 98 | To Ohio Central Railroad, to Arkansas & Missouri Railroad Jun 2005 | |
| 3554 | MR-20b | Jun 74 | M6081-25 | 3554 | Sep 21 98 | To Ohio Central Railroad, to Arkansas & Missouri Railroad Jun 2005 | |
| 3555 | MR-20b | Jun 74 | M6081-26 | 3555 | Sep 21 98 | To Hudson Bay Railway | |
| 3556 | MR-20b | Jun 74 | M6081-27 | 3556 | Sep 21 98 | To Hudson Bay Railway | |
| 3557 | MR-20b | Jun 74 | M6081-28 | 3557 | Sep 21 98 | To Hudson Bay Railway | |
| 3558 | MR-20b | Jun 74 | M6081-29 | 3558 | Sep 21 98 | To Hudson Bay Railway | |
| 3559 | MR-20b | Jun 74 | M6081-30 | 3559 | Sep 21 98 | To Hudson Bay Railway, scrapped at The Pas MB 2008 | |
| 3560 | MR-20c | Nov 76 | M6092-01 | 3560 | Feb 27 98 | To Tennken Railroad (Dyersville TN) 1998, to West Tennessee Railway, to Ontario Midland Dec 2021 | |
| 3561 | MR-20c | Nov 76 | M6092-02 | 3561 | Oct 8 96 | Scrapped Mont Joli QC 1997 | |
| 3562 | MR-20c | Nov 76 | M6092-03 | 3562 | Feb 5 98 | To St. Lawrence & Atlantic (Quebec) No. 3562 1998, to Maine Eastern, Scrapped at Morristown & Erie Railroad, Morristown NJ Mar 2014 | |
| 3563 | MR-20c | Nov 76 | M6092-04 | 3563 | Nov 28 97 | To CANAC, to Kelowna Pacific, Railway, to Lake States Railroad May 2004 (LSRC blue), to Great Western Railway No. 2004 2008 | |
| 3564 | MR-20c | Nov 76 | M6092-05 | 3564 | Nov 12 96 | Scrapped Mont Joli QC 1997 | |
| 3566 | MR-20c | Dec 76 | M6092-07 | 3566 | Jan 26 98 | To National Railway Equipment (Dixmoor IL) 1998 | |
| 3567 | MR-20c | Dec 76 | M6092-08 | 3567 | Feb 27 98 | To Ohio Central 1998, to Arkansas & Missouri Railroad No. 74 Jun 2005 | |
| 3568 | MR-20c | Dec 76 | M6092-09 | 3568 | Feb 27 98 | To St. Thomas & Eastern No. 3568 1998, to Oil Creek & Titusville 2003 | |
| 3569 | MR-20c | Dec 76 | M6092-10 | 3569 | Feb 13 98 | To St. Lawrence & Atlantic (Quebec) No. 3569 1998, to Exporail (Delson QC) 2003 | |
| 3570 | MR-20c | Dec 76 | M6092-11 | 3570 | Aug 19 96 | To CANAC, to Kelowna Pacific | |
| 3571 | MR-20c | Dec 76 | M6092-12 | 3571 | Aug 8 97 | To CANAC, to Kelowna Pacific, to Lake States Railway May 2004 (LSRC blue), to Great Western Railway No. 2003 2008 | |
| 3572 | MR-20c | Dec 76 | M6092-13 | 3572 | Feb 5 98 | To National Railway Equipment (Dixmoor IL) 1998 | |
| 3573 | MR-20c | Dec 76 | M6092-14 | 3573 | Feb 26 98 | To St. Lawrence & Atlantic (Quebec) No. 3573 1998, to Pook Valley Leasing No. 44 2003 | |
| 3574 | MR-20c | Dec 76 | M6092-15 | 3574 | Feb 5 98 | To National Railway Equipment (Dixmoor IL) 1998, to Minnesota Commercial Railroad No. 35 | |
| 3575 | MR-20c | Jan 77 | M6092-16 | 3575 | Mar 18 98 | To St. Thomas & Eastern No. 3575 1998, to Lake States Railroad May 2004 | |
| 3576 | MR-20c | Jan 77 | M6092-17 | 3576 | Aug 29 97 | To Tennken Railroad (Dyersville TN) 1998, to West Tennessee Railroad,No. 3576 | |
| 3577 | MR-20c | Feb 77 | M6092-18 | 3577 | Feb 26 98 | To Lake States Railroad No. Jul 798 (painted blue) Jul 98, stored by Mar 2011, Scrapped by LSRC c. Nov 2011 | |
| 3578 | MR-20c | Feb 77 | M6092-19 | 3578 | Feb 13 98 | To St. Lawrence & Atlantic (Quebec) No. 3578 1998, to Southern Railway of New Jersey No. 416 2003 | |
| 3579 | MR-20c | Feb 77 | M6092-20 | 3579 | Feb 13 98 | To St. Lawrence & Atlantic (Quebec) No. 3579 1998, to Southern Railway of New Jersey No. 418 2003 |