Keyrail Flats kits from Lunde Studios are HO Scale modular backdrop building walls which are easily mixed and matched to create intricate building flats along the backdrops or backside of your layout scenes. They're typical of the trackside brick structures and kits include loading docks, vehicle doors, blank walls and more. Modular design allows you to combine multiple kits on either side and top for multi-story walls, and separate, self-locating windows and doors come pre-cast in color. They're typical of the business side of buildings and feature architecture found on industrial buildings across the continent. Keyrail Flats are part of the line of Lunde Studios HO Scale resin structure kits.