A portion of the car, usually in the center of the car but offset towards one end, is split between two levels. The offset results in floorplans having a "long end" and a "short end" on the main level. Stairs then go up to the dome and down to the lower level, with the lower level below the dome usually offering restrooms or a small lounge area, while the upper portion is usually coach or lounge seating within a "bubble" of glass on the car's roof. Passengers in the upper portion of the dome are able to see in all directions from a vantage point above the train's roofline.