40' 1937 AAR Box Car

Prototype Information

The 1937 AAR 40′ boxcar is an iconic design, marking a turning point in railroad history by standardizing freight car production. Its development was driven by economic pressures during the 1930s, as railroads sought cost-effective solutions through standardized manufacturing. This approach not only reduced production expenses but also streamlined maintenance and operations.

Key specifications of the 1937 AAR boxcar include:

Interior Dimensions: Length: 40 feet, 6 inches, Height: 10 feet, 0 inches, Capacity: 3,700 cubic feet

Design Features: Dreadnaught ends, Straight-panel “Murphy” roof, 50-ton trucks with cast sideframes

Variations of the design, such as NSC-2 and Deco ends, added diversity while maintaining the core standardized features. These boxcars were immensely versatile, handling a wide range of freight and remaining in active service across North America from the late 1930s through the 1970s. Their widespread use underscores their role in shaping mid-20th-century railroading.

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