50' AAR Box Car
Prototype Information
The 50-foot AAR boxcar reshaped freight service in the late 1940s as railroads pushed for larger, more efficient equipment to handle booming postwar traffic. Designed under Association of American Railroads standards, it expanded the proven 40-foot design to offer more space and flexibility for shippers.
Railroads favored the 50’ AAR boxcar for its welded steel construction, wide 6- or 8-foot doors, and rugged build that handled everything from paper and appliances to auto parts. Its extra length boosted capacity without requiring new infrastructure, making it an easy upgrade for railroads nationwide.
By the 1950s, the 50-foot AAR boxcar had replaced thousands of 40-foot cars and set the new benchmark for general freight service—an enduring symbol of mid-century railroad innovation and efficiency.
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Intermountain N 50′ AAR Single Door Box Car Southern Pacific “DF”
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