In 1959 Pacific Car & Foundry (PC&F) worked with Southern Pacific to design and develop a new series of cars, Insulated Boxcars or RBL. They started with centered 9-foot doored cars in a Plate B clearance for the canned and food stuffs trade that was needed on a majority of SP and it's subsidiary SSWs service areas. As the design developed over 3 years, in late 1962 a 10-foot offset doored design was designed. Which is the subject of this model.

The entire upper body of the boxcar was riveted together from the bottom sill up, in the 6+5 R pattern. Whereas the underframe was fully welded. These were insulated, had proven 20-inch cushioned underframes,  usually Hydra-Cushion cushioning devices. Many types and configurations and combinations of loaders were used as per customer specifications, but these specifically had Moveable Bulkheads, or DF-B loaders, as well as Evans air-pak added in 1969

Design features faithfully rendered in the assembled car

• Overhanging Stanray roof
• Roofwalk and crossover platform APEX
• Perfect to prototype PCF versions of Stanray R3-4 riveted ends, with separate roofwalk end bracket
• NEW car sides PCF signature rivetted, with PCF style ladders, with specific prototype door stops, door gussets and sill design
• Accurate Moloco's cushioned draft gear coupler boxes
• Specific cushioning devices and associated underframe layout and details dependent on roadname, including another first for moloco, Delivery as well as Rebuild style underframes
• NEW MOLOCO 70t Roller Bearing trucks, National C-1 style trucks
• Rubber airhoses the first in the industry by Moloco