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
International Rubber Regulation Agreement by lack of knowledge of the chemical structure of rubber compounds until after 1945. DuPont had developed neoprene in the 1920s in response to the Stevenson Plan, but neoprene was too costly for making tires. During this period the International Rubber Research & Development Board and the Research Association of British Rubber Manufacturers were founded. Also other technologically advanced countries like Germany and the Soviet Union developed in the interwar period synthetic rubber (e.g. Buna. But this was always more expensive than natural rubber. The first and only agreement to come from the United Nations Conference on Trade and Development