A method and assembly for sensing moisture on the exterior surface of a sheet of glass by capturing an ambient image of light rays passing through the glass from the exterior to the interior surfaces thereof under ambient light conditions. The system includes: a switch for receiving a data signal and a clock signal as inputs, and outputting a voltage signal; a unit for controllably adjusting the phase of said clock signal before input to the switch; an optical modulator for receiving a continuous wave light signal and the voltage signal as inputs, and outputting one of an RZ and a CSRZ signal. The first sealant ring provides a hermetic seal that maintains a desired operating environment for the one of the first and second actuating mechanisms and a mechanical support for a top plate. The machining rotatory spindle automatically rises and the electrode docking turntable returns to an original position. The conductive spring washer, since it has spring-like properties, will also undertake to bear a limited amount of the load of the railroad car center plate in addition to providing an electrical connection between the car and truck.