The first ten full-length domes were built by Pullman for the Milwaukee Road's Chicago-Seattle "Olympian Hiawatha". The Milwaukee Road paid $320,000 each for their "Super Domes" and used them on that route until 1961, after which four cars remained in service between Chicago and the Twin Cities; these last four were sold to Amtrak upon its formation in 1971. Like most Pullman domes the Milwaukee domes were tall rather than the Budd/ACF standard . The Santa Fe and Great Northern also bought full-length domes from Budd in 1954 and 1955. All but one of Santa Fe's cars were sold to Auto-Train in 1971.