In 1993 Conrail began rebuilding 40 SD40's to the improved Dash-2 specifications, and renumbered them into the 6960 -6999 series. 30 of the units were rebuilt from Conrail's own SD40's, while 10 additional SD40's were of former Kansas City Southern heritage purchased from PAC Rail leasing. The 3,000hp units have individual subtleties to them such as the type of handbrake and placement, air horn type and cab vent. The units were then leased to Conrail from PACRail.