4,150 Horsepower -- Built in 1991 by GE - Erie, Pennsylvania
Existing Roster
| 8543 | 8544 | 8545 | 8546 | 8547 | 8548 | 8549 | 8550 | ||
| 8551 | 8552 | 8553 | 8554 | 8555 | 8556 | 8557 | 8558 | 8559 | 8560 |
| 8561 | 8562 | 8563 | 8564 | 8565 | 8566 | 8567 | 8568 | 8569 | 8570 |
| 8571 | 8572 | 8573 | 8574 | 8575 | 8576 | 8577 |
Union Pacific's C42-8 Renumbering Plan
| CNW No. | UP No. | CNW No. | UP No. | |
| 8543 | 9091 | 8561 | 9073 | |
| 8544 | 9092 | 8562 | 9074 | |
| 8545 | 9093 | 8563 | 9075 | |
| 8546 | 9094 | 8564 | 9076 | |
| 8547 | 9095 | 8565 | 9077 | |
| 8548 | 9096 | 8566 | 9078 | |
| 8549 | 9090 | 8567 | 9079 | |
| 8550 | 9097 | 8568 | 9080 | |
| 8551 | 9098 | 8569 | 9081 | |
| 8552 | 9099 | 8570 | 9082 | |
| 8553 | 9065 | 8571 | 9083 | |
| 8554 | 9066 | 8572 | 9084 | |
| 8555 | 9067 | 8573 | 9085 | |
| 8556 | 9068 | 8574 | 9086 | |
| 8557 | 9069 | 8575 | 9087 | |
| 8558 | 9070 | 8576 | 9088 | |
| 8559 | 9071 | 8577 | 9089 | |
| 8560 | 9072 |