Door assemblies for insulated boxcars and refrigerated boxcars

A door assembly for an insulated boxcar or a refrigerated boxcar, the door assembly comprising:

• a generally planar base having front and rear surfaces, opposed horizontal end portions, and opposed vertical end portions;
• a liner spaced from the rear surface of the base, the liner having a central portion and a perimeter portion surrounding the central portion, the central portion being more spaced from the base relative to the perimeter portion, the perimeter portion being adjacent to the horizontal and vertical end portions;
• a perimeter gasket attached to the perimeter portion and surrounding the central portion;
• a first end wall member having spaced first and second portions, the first portion is attached to the first end portion of the base and the second portion is attached to the third end portion of the perimeter portion, the third end portion being disposed between the first portion and the perimeter gasket;
• a second end wall member having spaced fourth and fifth portions, the fourth portion is attached to the second end portion of the base and the fifth portion is attached to the perimeter portion, the perimeter portion being disposed between the fourth portion and the perimeter gasket, wherein each of the first and second end wall members is distinct from the base and the liner, wherein the base is distinct from the liner, and wherein the base, the liner, and the first and second end wall members define an interior compartment therebetween;
• and
• insulation disposed within the interior compartment, wherein the first and second end wall members are shaped such that insulation is disposed within one or more planes that are perpendicular to the base and to the perimeter portion of the liner and that include a portion of the perimeter gasket.