NS 7518
| Uprated from 4,000 to 4,400 horsepower |
ES44DC
| 56445 | 1 | 208820 |
NS 7601
| Upgraded from ES40DC.blt 7/2006, in svc. 22Aug.2006, Frame/Order#1996--90 |
ES44DC
| 57010 | 4 | 190051 |
NS 7606
| Rerated to 4400 HP 11/2013blt. Jul.2006, in svc, 8/23/2006, Frame# 1996-78 |
ES44DC
| 57015 | 2 | 192700 |