GP7
Conrail's fleet of nearly 400 GP7's came from Central Railroad of New Jersey, Erie Lackawanna, Penn Central, and Reading Company. They were series CR 5600-5999.
GP8
In 1976, Conrail began rebuilding GP7's into GP8's, assigning them to the 5400-5462 series. Some units were initially numbered 5720-5728 but in 1978 were renumbered to 5400-5408.
GP9
Conrail's fleet of nearly 600 GP9's came from Penn Central, Erie Lackawanna, and Lehigh Valley. They took series CR 7000-7559. By 1980, rebuilt GP10's will take the 75xx series.
GP9B
Penn Central was the only Conrail predecessor to own the cabless GP9B. Used to increase traction, the GP9B (CR 3800-3839) was interesting but didn't survive beyond 1980, when CR quickly retired them.
GP10
Between 1976 and 1979, Conrail rebuilt their aging GP9's into 1,800hp GP10's (CR 7513-7597). They generally saw yard and local service until CR retired the last of the fleet in 1997.
GP15-1
Conrail was the largest Class 1 railroad in North America to own the 1,500hp GP15-1 road switcher, with 100 units arriving on the system in late 1979 and being assigned series CR 1600-1699.
GP18
Conrail received only four GP18's from the Lehigh Valley (LV 302-305) and assigned them to the series CR 7496-7499. Standardizing their roster, Conrail retired all four units during the early 1980's.
GP20
Conrail received only 13 GP20's from the Penn Central (former New York Central) and assigned them series CR 2100-2112. These orphan locomotives remained in active duty until Conrail retired them in 1985.
GP30
Conrail got their GP30's from Reading Company and Penn Central as CR 2100-2249. During the 1980's, Conrail retired, stored, reactivated, and then stored them again. They finally left the roster in the early 1990's.
GP35
Conrail inherited their GP35's from the Reading Company, Erie Lackawanna, and Penn Central. Conrail assigned these locomotives to the series CR 2250-2399 and 3620-3692.
GP38
In 1976, Penn Central and the Pennsylvania-Reading Seashore Lines provided all of Conrail's original GP38 road switchers. Later, three were added from failed rebuild programs. Series CR 7600, 7604, 7635, and 7660-7939.
GP38AC
Conrail inherited their fleet of four 2,000hp GP38AC's from the Lehigh Valley and assigned them to the series CR 7656-7659. These units remained in service until the end of Conrail.
GP38-2
Conrail inherited 223 GP38-2's from Penn Central, but the government gave Lehigh Valley's geeps to the Delaware & Hudson. Between 1977 and 1979, Conrail purchased new GP38-2's, placing them in series CR 7940-8281.
GP40
Conrail's GP40's came from Penn Central as well as newly purchased units, assigning them series CR 3000-3274. By 1995, Conrail retired and sold off all their GP40's except one (CR 3264).
GP40-2
The GP40-2's (CR 3275-3403) came from the Reading Company and several orders of new units between 1977 and 1980. Conrail used these engines primarily for fast, light freights, such as intermodals.