Trucks: B-B
Engine: 12-251-C3V, 2,000hp
Gear ratio: 65:18
Maximum speed: 65mph
Operating weight (lbs.):
Tractive effort:
Length: 61′ – 0″
| Road no. | Class | Build date | Builder’s no. | Renumbered to | Date | Notes |
| 2580 | MR-20d | Sep 81 | M6115-01 | 3580 | ||
| 2581 | MR-20d | Sep 81 | M6115-02 | 3581 | ||
| 2582 | MR-20d | Oct 81 | M6115-03 | 3582 | ||
| 2583 | MR-20d | Oct 81 | M6115-04 | 3583 | ||
| 2584 | MR-20d | Oct 81 | M6115-05 | 3584 | ||
| 2585 | MR-20d | Oct 81 | M6115-06 | 3585 | ||
| 2586 | MR-20d | Oct 81 | M6115-07 | 3586 | ||
| 2587 | MR-20d | Oct 81 | M6115-08 | 3587 | ||
| 2588 | MR-20d | Oct 81 | M6115-09 | 3588 | ||
| 2589 | MR-20d | Oct 81 | M6115-10 | 3589 |