These 4-axle locomotives were powerful ones, creating 3600 horsepower. They were first placed on fast train duty, moving intermodals and container trains. Most of Seaboard's 120 units are still in service as of 2006. Conrail's units were all retired in 2000 and 2001. Notable exceptions among Conrail's units were CR 5045 and 5052, which were destroyed in the infamous wreck of the Colonial at Chase, Maryland, on January 4, 1987.
One of the Cotton Belt Railroad's B36-7s was damaged in a wreck within a year of delivery and rebuilt as a B unit. This engine did not receive a special model designation to indicate its cabless status. Railfans sometimes term it a B36-7(B).
