Abstract: A hanging trolley system includes a body, a plurality of first support wheels, and a brake system. The body includes upper and lower portions. The first support wheels are coupled to the upper portion of the body for rotation relative thereto about corresponding first axes that are parallel to each other. The first support wheels are configured to roll on an upward facing first surface of a rail to support the body on the rail. The brake system includes a traction wheel, a first component, and a second component. The traction wheel is coupled to the lower portion of the body for rotation relative thereto about a second axis and is configured to roll along a second surface of the rail. The first component is coupled to the traction wheel for rotation therewith. The second component is configured to selectively inhibit rotation of the first component.