These 50' box cars with plug door are painted gold with aluminum side bands and black ends. The heralds and side lettering are printed in black and the end printing is white. The cars were built in August 1962 by Pacific Car & Foundry of Renton, WA, and run on roller bearing trucks. They were equipped with Car-Pac belt rail loaders and Hydracushion underframes. Freight equipment was becoming more specialized during the 1960s, and the Rio Grande began leasing or purchasing cars for participation in car pools, including insulated boxcars.