Provided is a display device capable of correctly displaying an image when surplus outputs are produced within a driver, regardless of a shifting direction of a shift register within the driver, without bringing about increase in cost and increase in consumption current. Therein the die plate and the end plate are connected to one another via tie bars on which the movable mold-clamping plate is displaceably guided, and a toggle-lever arrangement, on which a drive unit acts is provided between the end plate and the movable mold-clamping plate. A method for testing a rail car brake system includes connecting test air to a valve manifold, connecting the valve manifold to the brake system, and testing the brake system using a control circuit configured to automatically position valves in the valve manifold according to a prescribed test.