Conrail inherited their fleet of 20 U25C's from Penn Central, which inherited them from the Pennsylvania Railroad. Originally, Conrail had assigned these U25C's to series CR 6500-6519 but renumbered them in January 1979 into the CR 6800-6819 series, making way for the newly arriving order of SD40-2's that year.

Comprehensive GE U25C Roster

The roster below is comprehensive for Conrail's U25C when they arrived from Penn Central on April 1, 1976 until their last day of service on Conrail.

CR #   Former    Prior     
========================
6800   CR 6500   PC 6500   
6801   CR 6501   PC 6501
6802   CR 6502   PC 6502
6803   CR 6503   PC 6503
6804   CR 6504   PC 6504
6805   CR 6505   PC 6505
6806   CR 6506   PC 6506
6807   CR 6507   PC 6507
6808   CR 6508   PC 6508
6809   CR 6509   PC 6509
6810   CR 6510   PC 6510
6811   CR 6511   PC 6511
6812   CR 6512   PC 6512
6813   CR 6513   PC 6513
6814   CR 6514   PC 6514
6815   CR 6515   PC 6515
6816   CR 6516   PC 6516
6817   CR 6517   PC 6517
6818   CR 6518   PC 6518
6819   CR 6519   PC 6519