An apparatus that enables a train or trailer vehicle to communicate with other vehicles in the same train without using vehicle identifiers other than the relative positions of the two vehicles within the train. At the outer ring and at the inner ring of the free-wheel clutch there are formed clamping ramps cooperating with clamping balls lying therebetween. The connector may be further configured such that the third portion severs in response to a threshold amount of axial force, axial foreshortening, andor cyclic loading or fatigue, in order to predispose the severance of one or more pre-configured connectors in a controlled manner to minimize any potential harm to the surrounding vasculature of a patient. The second capacitor array module has a plurality of capacitors. A character input method in a terminal having a touch screen.