Budd–Michelin rubber-tired rail cars which featured innovative and distinctive pneumatic tires. The company claimed that its application of tires on its rail cars afforded both a substantially more cushioned ride and increased the cars' traction by 35%. The design of Michelin's tired wheels included an aluminum safety ring and a flange that were only used in the event of a puncture or other type of tire failure; during normal operation, only the rubber tire made contact with the rail. Inspired by Michelin's success, the Budd Company set its sights on marrying the new rubber rail tires with its shot-welded, stainless-steel carbodies; it had developed
United States Rubber Company brands. In 1940, U.S. Rubber purchased the remainder of the Gillette Safety Tire Company, and began to expand and modernize the Eau Claire factory, greatly increasing production. During World War II, U.S. Rubber factories were devoted to production of war goods, and produced military truck and airplane tires, as well as the canvas-top, rubber-soled Jungle boot for soldiers and marines serving in tropical and jungle environments. U.S. Rubber ranked 37th among United States corporations in the value of wartime production contracts. In 1942, the United States government restricted the sale of scarce rubber products for civilian use and production at