Pilots

In railway signalling, a token is a physical object which a train driver is required to have or see before entering onto a particular section of single track.

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NASA was a pioneer in developing and testing hypersonic aircraft (speeds beyond Mach 5.) Much of this happened in secret, across NASA's "X Program" of experimental vehicles. There were even 8 NASA pilots who secretly became astronauts during the cold war, as they flew the X-15 above 80KM.

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