Abstract: An adjustable railway car door kit having a bottom section and a top section which have front and rear channel-shaped post means that receive a reinforcement alignment channel therein so that the top section can be permanently welded to the bottom section through the post means and the extension, as well as the overlapping portion of the sheets that extend between the post means. A width adjustment is also provided through a integral flange on the rear post means and a generally J-shaped rear edge extension, which can be welded in adjusted positions to the flange.