In 1958 the KB-29s were upgraded to the jet-assisted KB-50Js which were specially equipped with two General Electric J47 turbojet engines that enabled the tankers to match the speed of the faster jet fighters during refueling
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Two second-hand General Electric J47-19 jet engines (designed as boosters for the Convair B-36 intercontinental bomber) were mounted atop an existing Budd Rail Diesel Car (an RDC-3, part coach, part baggage and mail configuration) body which had received a streamlined front cowling.