AZL 71945-2 C&O Chesapeake & Ohio AF268-Z10A RPO US MAIL RAILWAY POST OFFICE #106

The cars features smooth running three axle trucks, inset window glazing, intricate pad printing and prototype accurate details.

Heavyweight refers to early 20th century cars built before the late 1930s. They were often made of riveted steel construction with 6 wheel trucks (not always) and large clerestory or arched roofs that tapered or curved at the ends. Heavyweights often had a poured concrete floor resulting in a smooth ride.