B23-7
Between 1977 and 1979, Conrail purchased 141 2,500hp B23-7's, with many staying on roster until the final days of the railroad. They were in series 1900-2023 and 2800-2816.
B30-7R
When they took over the Monongahela in May 1993, Conrail inherited MGA's S23-7B "Super-7's" (MGA 2300 - 2310) and began upgrading the units to B30-7R's. MGA 2300-2310 were renumbered as CR 2030-2040.
C30-7
In 1977, Conrail purchased their first 6-axle locos, the 3,000hp C30-7, assigning them to series CR 6600 - 6609. They also purchased 65 units from Santa Fe, placing them in leasing service as CRL 500-564.
C30-7A
The 3,000hp, 12-cylinder C30-7A is unique to Conrail. Between May and June 1984, Conrail took delivery of 50 units, assigning them to series CR 6550-6599.
B36-7
Conrail placed the first large order for General Electric's B36-7 in 1983, ordering 60 units and placing them in series CR 5000-5059.
C36-7
In 1985, Conrail purchased 25 3,700hp C36-7's and assigned them to series CR 6620-6644, with all staying on roster until the end of the railroad.
C32-8
In 1984, Conrail purchased 10 3,200hp C32-8's, assigning them CR 6610-6619. Considered problematic "white elephants," the units entered ballast service in 1997. They were not overhauled prior to repainting.
C39-8
Conrail purchased 22 3,900hp C39-8's in 1986 and assigned them to series CR 6000-6021.
B40-8
In 1988, Conrail purchased 30 high-speed 4,000hp B40-8's for intermodal service, assigning them CR 5060 - 5089. These remained the highest horsepower 4-axle diesels in North America until Amtrak's 4,200hp P42.
C40-8
Conrail purchased 25 4,000hp C40-8's in 1989 and assigned them to series CR 6025-6049.
C40-8W
Between 1990 and 1994, Conrail purchased 216 4,000hp C40-8W's, assigning them CR 6050-6265. In 1994, they bought 60 units for their LMS leasing, assigning them LMS 700-769, many of which were repainted CR Quality.