NS 9961
| Uprated from 4,000 to 4,400 horsepower |
C44-9W
| 55407 | 46 | 209125 |
NS 9967
| Rerated to 4400 HP 11/2013 |
C44-9W
| 55413 | 56 | 194520 |
NS 9973
| Uprated from 4,000 to 4,400 horsepower |
C44-9W
| 55419 | 35 | 209321 |
NS 9977
| Rerated to 4400 HP 11/2013 |
C44-9W
| 55423 | 36 | 194494 |