A trolley retrieval system for transporting or returning trolleys from a finish area back to a start area for traveling along a cable. The systems may include a cable held in suspension between the first and second supports. A retrieval line may be suspended in a closed loop extending from proximate the first support to proximate the second support. A trolley for traveling along the cable may be selectively connectable to the retrieval line. A motivator may selectively circulating the retrieval line around the loop. A controller may control operation of the motivator.