In 1990, Peak 9 received its second high speed quad when Poma built the Beaver Run SuperChair, which replaced Lift D and provided top-to-bottom lift service on Peak 9. It is the longest operating lift on the mountain (1.7 miles), and also has the largest vertical drop of any chairlift on the mountain (1,600 feet). A few of Lift D's towers were repurposed as a lift evacuation training area, located just uphill from where the Beaver Run SuperChair crosses under the Peak 8 SuperConnect.