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
Waste tires to kill advantageous bacteria in the soil, creating yet another economic problem. Originally, this was the primary form of disposal for scrap rubber (70% in 1977), but due to the decreasing availability of space, this process is no longer considered feasible. Since the inability for landfills to provide adequate space for tire disposal, other forms of disposal and reclamation have been put into place, using waste tires as both commodities (new tires) as well as a form of energy (fuel alternative). Waste tires create problems such as landfilling, health, and environmental challenges. Accumulation of waste tires, which are non-biodegradable polymers