Abstract: For zip line braking, a brake cable travels between at least two terminals. A brake applies a braking force to travel of the brake cable. A link arm is in physical communication with the brake cable. A trolley receiver in physical communication with the link arm and slidably traveling along a zip line receives a trolley slidably traveling along the zip line. The trolley receiver transfers the braking force through the link arm to the trolley.

Abstract: A self-cooling trolley includes a wheel formed of a non-ferromagnetic material with a groove between two flanges disposed on a circumference. At least one pair of magnets are disposed in proximity to the wheel. Each pair of magnets comprises a north magnet with a north magnetic pole in proximity to the wheel and a south magnet with a south magnetic pole in proximity to the wheel. The at least one pair of magnets generate an eddy current within the rotating wheel opposing an angular motion of the wheel. Self-cooling means is provided on the wheel to generate an air flow toward and/or away from the wheel as the wheel rotates. Related methods are also described.

Abstract: A self-cooling trolley includes a wheel formed of a non-ferromagnetic material with a groove between two flanges disposed on a circumference. At least one pair of magnets are disposed in proximity to the wheel. Each pair of magnets comprises a north magnet with a north magnetic pole in proximity to the wheel and a south magnet with a south magnetic pole in proximity to the wheel. The at least one pair of magnets generate an eddy current within the rotating wheel opposing an angular motion of the wheel. Self-cooling means is provided on the wheel to generate an air flow toward and/or away from the wheel as the wheel rotates. Related methods are also described.

Abstract: For zip line braking, a brake cable travels between at least two terminals. A brake applies a braking force to travel of the brake cable. A link arm is in physical communication with the brake cable. A trolley receiver in physical communication with the link arm and slidably traveling along a zip line receives a trolley slidably traveling along the zip line. The trolley receiver transfers the braking force through the link arm to the trolley.