Budd–Michelin rubber-tired rail cars remained obscure in comparison with other competitors for the title, such as the "Pioneer Zephyr" and Union Pacific's M-10000. Rubber-tired rail cars achieved greater success in France, and similar rubber-tired subway cars have been adopted in Canada and Mexico as well as on numerous systems in Europe. During the 1920s, the American Budd Company, at the time a relatively obscure auto-frame supplier, developed an extensive working relationship with the French firm Michelin, which was best known for its tires. In 1929, Michelin built its first rail car, and by 1932 nine of its cars were in operating service, all of
United States Rubber Company stocks in 1928 and U.S. Rubber was dropped. In an effort to increase its share of the automobile tire market in 1931, U.S. Rubber Company bought a substantial portion of the Gillette Safety Tire Company. The company was founded in 1916 by Raymond B. Gillette and its primary manufacturing plant was located in Eau Claire, Wisconsin. The Gillette plant held large contracts with the General Motors Corporation and with the addition of U.S. Rubber products, became one of the world's largest suppliers of original equipment tires. U.S. Rubber produced tires under the Gillette, Ward, Atlas, U.S. Rubber and U.S. Royal