MTH - RailKing Freight Cars - 50 ft. Double Door Plugged Boxcar - O Scale 3 Rail 

While usually referred to as an insulated boxcar, the prototype for this car, according to the Association of American Railroads (AAR), is technically a bunkerless refrigerator car, class RBL. Built by Evans Products Company at Blue Island, Illinois from 1969-1977, these cars were designed for shipments that need protection from temperature extremes but do not require refrigeration. They have hardwood floors and at least 3" of insulation in their sides, ends and roofs. Produce is a common cargo. The cars' length and wide 16' door openings have also made them popular with plywood and lumber shippers.