"These 53'-6" flatcars were constructed with a welded fish belly steel frame in contrast to the cast steel GSI frame. The fish belly frame provided an optimal distribution of tension and compression forces from the center of the car to the bolsters. Think of it as a bridge. In addition, fabricating a welded frame was far less labor intensive than an equivalent riveted frame. The welded frame proved extremely durable holding up to rugged service. As these flat cars aged-out due to ARR interchange age limit, they found it's way into many years in maintenance-of-way service. A number of builders constructed these flat cars such as the Pacific Car & Foundry (P.C. & F.), Marine Industries (Canada), Pullman-Standard, Bethelehem Steel, and including railroad car shops such as the Western Pacific.
Canadian National Railways purchased a group of Marine Industries 1963-built welded fish belly flatcars. They were assigned to general purpose use. About 1968, the infamous ACI labels began to appear on the rolling stock as shown on our Wheels of Time model."
Pre-orders will remain open until May 6. Delivery is expected Spring 2023.