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 company again expanded the plant in 1965 to produce tires for construction machinery, and for many years it was the largest private employer in Eau Claire and the second largest in neighboring Chippewa Falls before it was closed in 1991. In late 1943, U.S. Rubber engineer Dr. Louis Marick developed a propeller de-icing system in which a rubber boot was fitted onto the leading edge of a propeller. The boot contained wires that conducted electricity to heat the edge and break-up ice. In 1958, Uniroyal entered into a partnership with the Englebert tire company of Liège, Belgium, which became known