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WD Codes"
Reserved for future model year vehicles built during current year's production. Also known as "alpha", "beta" and "pilot" cars.
WD1 "Pilot Vehicle"
WD2 "Factory Prototype"
WDO "Containment Vehicle"
I believe that the pilot vehicles are used as test mules to get features, options and design changes up and running. The prototype vehicles are used to get parts of the assembly line up and running for an upcoming model year near the end of the previous model year or during the change over.