Sliding door box cars were basically the build standard prior to World War II. It wasnt until after the war that many railroads experimented with the use of plug doors, similar to those used on many refrigerator cars, on their box cars. The tight seal of the plug door, accompanied by insulated sides, ends, floor and roof panels, allowed these new box cars to carry perishables where temperature control was important but refrigeration wasnt necessary. This design, classified by the AAR (Association of American Railways) as RB or RBL, meaning bunkerless refrigerator cars, gained popularity in the mid 1950s and the following decade saw over 3,000 similar cars built for a number of different owners.

• Highly detailed, ready-to-run model with accurate painting and printing
• Late improved Dreadnaught ends
• Overhanging diagonal panel roof with or without roofwalk as per the prototype
• Straight-side sill body design
• 8/8 panel, riveted sides
• Highly detailed underframe
• Separately-applied ladders, grab irons and latch bars
• Blackened metal wheels
• AccuMate couplers