02-05-2010, 03:36 PM
Well, the reason that a plug door worked is that it's thicker than a regular sliding door, so there's room to insulate it. In operation, it's like the side door of a van, lifting clear from the carside, and rolling on tracks. A regular sliding boxcar door is basically a sheet of stamped steel, with some added hardware - there's no room for insulation of any kind.
Wayne
Wayne