"Propulsion was by means of a propeller located at the rear, accelerating the railcar to
143.0 mph, setting the land speed record for a petrol powered rail vehicle. Only a single example was ever built, which due to safety concerns remained out of service and was finally dismantled in 1939"
“The Horten Ho 229 was a late-World War II Nazi German prototype fighter/bomber. It was the first pure flying wing powered by a jet engine and designed to be more difficult to detect with radar – the first aircraft to incorporate what is now known as stealth technology.”
“The Avro Canada VZ-9 Avrocar was a vertical take-off and landing aircraft developed as part of a secret U.S. military project carried out in the early years of the Cold War"