Only 10 of these 3,200 hp (2,390 kW) locomotives were built. They were some of the first locomotives built in the DASH-8 line with all 10 going to Conrail as road numbers 6610 to 6619. When delivered they wore the standard Conrail Can Opener (Wheel on Rail) paint scheme.
In 1997 Conrail assigned all 10 units to "Ballast Express" service. They were repainted into a Gray version of the Quality scheme.