Wiki tells this story: “The Budd Company entered the market in 1932. Heretofore Budd was primarily an automotive parts subcontractor but had pioneered working with stainless steel, including the technique of shot welding to join pieces of stainless steel. This permitted the construction of cars which were both lighter and stronger. In 1941 Budd built the Prospector for the Denver and Rio Grande Western Railroad (D&RGW). This was a two-car DMU. Each car had a pair of 192 horsepower (143 kW) diesel engines and was capable of independent operation. The cars were constructed of stainless steel and included a mix of coach and sleeping accommodations. The design was popular with the public but undone by the difficult operating conditions on the D&RGW. It was withdrawn in July 1942, apparently another failure. However, several technical advances during the WWII would encourage Budd to try again.