American Freight Car Set, Era IV American Freight Car Set, Era IV Prototype: 5 different American freight cars, 2 gondolas painted and lettered for Western Pacific and Penn Central, 2 boxcars painted and lettered for Northern Pacific and Rock Island, and 1 tank car painted and lettered for Western Pacific. The cars look as they did in Era IV. Model: This is a freight car set with 5 different freight cars. All of the cars include custom imprinting. Total length approximately 355 mm / 14". These cars are not available individually.