40' Milwaukee Rib Side Box Car

Prototype Information

The Milwaukee Road 40′ rib-side boxcar is an iconic freight car known for its distinctive ribbed steel construction. It was developed by the Chicago, Milwaukee, St. Paul & Pacific Railroad (Milwaukee Road) in the late 1930s and remained in service for decades.

The Milwaukee Road designed and built these boxcars in its own Milwaukee Shops to reduce reliance on outside manufacturers. The rib-sided design was a unique feature that provided extra structural strength while using less steel compared to traditional smooth-sided cars. Most of these boxcars measured 40 feet in length and were primarily used to transport general merchandise and perishable goods.

The first cars were introduced in the late 1930s and were produced in multiple batches through the 1950s. Variants included single-door and double-door models, with different roof styles (such as flat-panel and diagonal-panel roofs). Over time, improvements were made in welded steel construction and load-bearing capabilities.

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