7. Plate rail. Though not always close to the top of a wall, the plate rail serves as a platform to display a collection of objects. The depth of the plate rail can vary from very shallow, in those instances where a plate is being displayed, to quite deep when large objects are to be displayed. A plate rail's location on the wall (higher up for deeper rails) will also determine its depth. For example, larger objects requiring a deeper rail will necessitate placing the plate rail higher on the wall so it's out of the way, while a thin rail for displaying plates can also serve as a chair rail.