According to a method for packaging one stack of multiply articles made of paper, a presser receives and compacts the stack of articles to be packaged and a pusher moves longitudinally the stack so as to make the stack hit a wrapping foil, previously placed vertically. The waterjet cutting system includes an inflatable and deflatable diaphragm to control the mixing of abrasive particulate material and liquid in a stream used to abrade a target object. In some implementations, the present invention also provides for a partition configuration where knowledge elements can be grouped and pattern recognition operations can be individually configured and arranged to allow for multi-level pattern recognition schemes. A method for visually displaying a condition of a lock on a railroad hopper car as through use of illumination is also disclosed.