This custom built trolley rail system is installed in a Toronto theatre to provide fall protection for workers who load bricks onto a fly system’s counterweight arbors. There is no existing guardrail on the arbor side of the loading gallery to allow for unobstructed space while loading the tightly-packed line sets. The system’s personal fall limiters attached to each trolley would limit a worker’s fall to a very short distance. It was designed with full range of motion in mind in case workers need to crouch down to load bricks lower on an arbor.